Hi there Nan Lane. Your in luck, I happen to know one of the biggest tropical fish stores in central Florida. It's called Sea in the City and is located at 441 Gaston Foster Rd, Fl. 32807.
Their website is here:
It's just south of SR 50 on the east side of town, off Lake Underhill rd. Use Google maps to find it. Hope you find what your looking for there. :)