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No you can't have danios, they are to active for a 20g I believe the minimum tank size for danios is a long 20g. I wouldn't get another kind of tetra because you would have to get at least 5 of them and that would really over stock your tank. What about 6 black widow tetras, 3 ottos (from what onemisterchristian said, don't expect them to live very long unless there is a constant algae supplier or I think you can feed them algae wafers till more algae builds up), 5 corys then I'd say your set.how about 3 corys, 6 black tetras, maybe 3 ottos, and either a couple zebras or another kind of tetra??
The big no-no in either setup is the bala shark. Baka sharks are schooling fish, they grow big, they are highly active. 90 gallons is probably a minimum. And a lonely bala shark is going to be just that-lonely!
Tiger barbs- well, a lot smaller than balas, obviously, but tank is still on the small side; as Durbkat says they are very active.
I think you should go for scenario 3:
5 cories
and either 8 black neons
or 6 lemon tetras
You could perhaps cut down the number of cories to 3, and have two small schools of say 6 tetras each.
3 cory cats
6 black neons
6 lemon tetra
3- otto cats
this wouldn't be over stocking??
I wouldn't get tiger barbs because tttnjfttt said that he wouldn't put them in anything under a 30g.the tiger barbs are provided that your tank is long, which it looks like it is a regular 20 gal. they need a whole lot of room to chase each other around!