No, I have freshwater tanks too... Here's the rundown on all my tanks:
6-gallon: freshwater molly fry tank
10-gallon: freshwater quarantine tank (currently vacant)
10-gallon: another freshwater quarantine, also vacant
10-gallon: saltwater quarantine tank, currently being used to prepare live rock
20-gallon: turtle tank
20-gallon: saltwater, just has one damsel now, but I'm going to try some of my corals in there
37-gallon: fancy goldfish
55-gallon: was freshwater Amazon river fish (your basic tropical fish), but it sprang a leak. I re-sealed it and will be filling it up today to test it.
60-gallon hexagon: My transplanted Amazon river fish. When their 55-gal tank gets fixed and they move back into that, I'll be moving my fancy goldfish into this one.
135-gallon: Saltwater reef tank. 2 clownfish, 1 yellow tang, 1 Pacific blue tang, 1 watchman goby, 5 green chromis, assorted corals, snails, and hermit crabs.