That 1" fish per gallon rule is outdated and incorrect for saltwater AND freshwater. Stupid stupid rule. If that was true you could keep freshwater: oscar 12" in a 12 gallon tank. or saltwater: dwarf angel 3-4" in a 4 gal tank. PLEASE! so dumb.
Think of the fish's adult size and the swimming space they need.
I have a 28 gal long macro algae reef tank. Currently housing 2 percs and a pep shrimp and some coral.
I will be adding a skunk cleaner, and possibly some sexys and either a coral beauty and a couple (2 gobies) OR a group of gobies (3-4) with sexy shrimp.
Like another said. It depends on what you want to do with your tank. If your going with coral that like low nutrients then keep only a few fish. If you have a skimmer you can add a couple more. Macro algae, a couple more. Keep adult fish size in mind. Nothing too big.
You really have to do your research. find out what kind of tank you want to keep first and then decide on fish to fit your habititat.
Ultimately i think you can fit 4 in there pretty good ex 2 clowns, goby and a 6 line wrasse or
a group of gobies, or 1 4" fish some people keep fu manchu lions or a frogfish in tanks this size. Stick with fish that can do well in nanos.
Again, do your research and find out what kind of tank you want first before selecting fish.
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