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Fish Keeping: Moving Fish to a New Tank

Updated on September 3, 2018

Where to Start

So, those cute little plecos and bala sharks you bought a year ago are getting a little big for your tank? Come to think of it, all of your fish seemed to have grown since you originally put them in. Now that forty gallon aquarium is looking a little cramped. Not to mention it needs constant water changes because you cannot keep the ammonia levels down. What can you do? Do you go to the pet store and exchange your large fish for smaller, cuter, ones? Do you move them to a larger thank? Do you, God forbid, flush them to a watery grave?

In my opinion there are only two options: exchange them for smaller fish or upgrade to a larger tank. There are some local pet stores that will buy large, or sometimes even aggressive fish, back from hobbyists. This can be great if you only want to keep small fish in your aquarium. I would also suggest doing some research so that you get new fish that will stay on the small side so that you don't have to repeat the process in a year or so.

However, I think it is better to upgrade them to a new tank, if possible. I know, bigger tanks are more expensive. They also take up a lot more space. While we are listing their cons let's not forget that they also need new filtration and all in all they will cost more to run than a smaller tank. But, if you have the funds and the will it is perfectly possible to upgrade your cramped fish to a bigger 'pond', so to speak.

There are, essentially, two main methods you can use. Because lets be honest, I am not going to recommend you just using a net to move a fish from one tank to another. You can use the slow drip acclimation method or you can try to save as much water as possible from the old tank mix it with new water and add the fish. Personally, if given the choice I'd use a slow drip to acclimation my fish.

Going Back to Kindergarten

If you haven't guessed by now you are going to have to start over. This means new gravel, filtration, tank, and lights. (Unless you just happen to have all of that laying around the house, by chance.) You are, essentially, setting up a system from scratch.

What I would do is get my tank and gravel set up first. Rinse the gravel, or sand if that is your preferred substrate, and line the bottom of the tank. I would then fill the tank with water and add all necessary chemicals. You don't need to have your decorations in place as you can always add them later. I would then set up my filtration and let it run for a few days.

That should all sound rather familiar, since it is how you set up your tank the first time. The only difference now is that you are moving fish from your current tank to the new one. I would try to match all of the water quality conditions as possible to make the transition easier on your fish. I would have the heaters in the two tanks set to the same temperature so that would be one less thing the fish needs to acclimate to, for example. If at all possible I would also try and match pH.

30 gallon freshwater fish tank
30 gallon freshwater fish tank

Would you move your fish to a larger tank?

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Moving the Fish

Now that you have your tank set up, it is cycled, and the water quality is as close as you can get it, it is time to move your fish. I would fill a five gallon bucket 1/4 full with water from the fish's current tank. I would then take a piece of airline tubing and start a siphon from the new tank into the bucket. As soon as the siphon starts tie a knot in the line. The knot will slow the siphon to a slower pace, or even better, a drip.

Theoretically it will take about an hour to fill the bucket, depending on the speed of your drip. When the bucket is full kill your siphon and use a net to move the fish from the bucket to the tank. It is as easy as that. During the time the fish are acclimating I would add my decorations, if I hadn't already done so. Sounds easy right? It is! I think the idea of the process taking a long time turns some people away or makes them think it will be harder than it is. All you have to do is start that siphon, knot the line, and let it be for an hour. Easy as pie.

Stress Coat

No matter which method you use for moving your fish you are going to need stress coat. It will help keep your fish covered in a mucous membrane so that they don't attract infractions or parasites. Any little thing you can do to make the acclimation process easier on you fish should be done. A little bit of stress coat goes a long way.

Method 2: What About Using Stuff From The Old Tank?

Sometimes you don't have the option of saving everything from your old tank. Maybe your old tank has sprung a leak. Maybe you had to feel the smaller tank to help fund the larger one. Or, you might not have the room in your home for two large fish tanks. If time is not in your favor you can still have a smooth acclimation process.

You can fill a five gallon bucket and put all of your fish in it while you work. If you absolutely must do this you must work as fast as possible, if you can place an airstone in the bucket that will help to keep the water saturated with oxygen. If you have a lot of fish use multiple buckets if you need to. The first thing I would do is remove the gravel, or sand, from the old tank and put it in the new one. You will, of course have to have a little new substrate as the new tank has a larger surface area than the old one. Use a bucket or drinking glass to scoop out the substrate from the old tank and move it to the new tank. This will kick up a lot of debris and the water will get cloudy. Once the substrate is in place it is time to move the water. Bucket by bucket I would siphon the water from the old tank and pour it into the new one. Of course, now would also be the perfect time to move the decorations as well. Once you have moved as much of the water as you can it is time to start filling with new water. Make sure that you are adding all the necessary chemicals to the new water!

Once the water is high enough to run your filtration get it running. If you haven't started adding it now is the time to add quick start. Quick start is supposed to cycle a tank instantly. I'm not sure if I completely buy into it, but it is the best you can do in a situation like this because this new tank will not have time to properly cycle. Once the tank is full I would let it run for a little while, this should help to clear the water a little bit. I assure you it will be cloudy from all the detritus of the old tank water and the dust from the new substrate. (Yes, there will still be a little dust even if you rinse it before it goes into the tank.)

After the water has cleared a little I would remove some of the water from the five gallon bucket with the fish and then start a siphon to will it with water from the new tank. Once the bucket is full I would then net the fish into the new tank. This should help make it a little easier.

A word of warning: this method will be a lot more stressful on the fish and runs a bigger risk of mortalities. They are in a bucket for a longer period of time than just having the second tank completely set up, cycled, and then drip acclimating them. More time in the bucket means a longer period of high stress, and chances are the new tank will not be properly cycled which will extend the time of high stress once they are in the new tank. That being said, chances are the fish will most likely be fine after a little while. Just think about how they most likely got to the pet store in the first place, that truck ride was most likely very stressful, bumpy, and long.

The Nitrogen Cycle

After the Move

Now that you have your new tank running and the fish have been added it is best to watch the fish closely for the next few days. Make sure they are all swimming correctly, aren't gilling heavily, and their coloration hasn't changed. If you encounter any of these issues try and correct them as best as you can. It might mean checking the water quality and doing a water change if need be, or turning the heat up or down, or even adjusting the flow from the air stone.

I would not add any new fish to this system for several weeks. This gives the system the time it needs to find a balance. It also gives the fish time to get used to their new home. Adding more fish too early could disrupt your water quality or stress your fish our even further.

Click thumbnail to view full-size
The 30 gallon was updated to a 60 gallonBala sharks are notorious for growing to large sizes.Larger tanks mean more room for schooling fish to swim and, well, school.
The 30 gallon was updated to a 60 gallon
The 30 gallon was updated to a 60 gallon
Bala sharks are notorious for growing to large sizes.
Bala sharks are notorious for growing to large sizes.
Larger tanks mean more room for schooling fish to swim and, well, school.
Larger tanks mean more room for schooling fish to swim and, well, school.

In The End

I hope that whichever method you end up using to move your fish that you are successful. I understand completely that fish often grow larger than expected. Sometimes they grow faster than expected as well. That is fine, that means that your fish are healthy. And that is a good thing. Just make sure that whatever you do is in the best interest of your fish and is safe for your fish.

Fish keeping is a great hobby. And a larger fish tank can mean more fish and bigger fish. It is like having your own aquarium at your house.

Comments

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    • isharkbait profile imageAUTHOR

      Alex 

      6 weeks ago from Virginia Beach, VA

      There are two methods of acclimation mentioned in this article. The method with the higher risk of mortality would be with the second method I would only use that way if I needed to change my fish right away and did not have the time or resources to use the drip acclimation method (like if I had a leak in the tank).

      When I move my fish from one tank to another I, personally, use the drip method. I fill a bucket with a little of the original tank water and put my fish in the bucket. I then start a siphon from the new tank with airline tubing. I tie a knot in the airline tubing so that it takes longer for the water from the new tank to fill the bucket. After an hour or so the water in the bucket should be nearly all water from the new tank. Then I would add my fish to its new home. This process is smoother, less of a shock, and better prepares the fish for the chemistry and temperature of the new tank.

      It seems as if some of the wording for my sections has been changed since HubPages lasted edited it, I will go back and fix it as soon as I can. Hope that helps!

    • profile image

      Kimberly Berrett 

      6 weeks ago

      Ok..I'm confused..I want to put my fantail goldfish, which has tripled in size, into a larger, previously used tank, so I came here to read what to do and in the middle of this article is says "Warning..this method will be a lot more stressful on fish and runs a bigger risk of mortality." Well I thought I was reading how to do it the right way, so why is there that warning? Please point me to where I can read how to do this without risks of mortality. ThankYou.

    • profile image

      Pharmc98 

      4 years ago

      Very nice site!

    • profile image

      Johnb544 

      4 years ago

      Real nice design and great articles, nothing else we want dfbkedfekggb

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