The only fish I had that schooled were blue eyed cardinals, they always stuck together. Anthias and chromis will always kill the weakest link, I had 5 chromis and now one remains.
It would be a bad move to get a bunch of chromis in a 20g IMHO....
If you want something cool to look at for the 20g why not get a frog fish or dwarf scorpion?
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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