I've taken care of a neighbors betta tank which was a 10 gallon with a school of rummynose tetra's in it and it was fine with them and I've seen plenty of tanks with them mixed with other non-fin nipping tetras and danios. The males are only aggressive with their own kind and gourami's and such usually. Some betta's are more aggressive than others though, but mines pretty passive. Right now he's in the 12 gallon which I added him into today. I'm slowly bringing him up to a temperature of about 77 cause his old tank was at about 70 or 71. Also, my neighbor has freshwater clams in his tanks, and he says they keep the nitrates down, and I've read they keep them down. I know the shrimp and snails don't do anything for it though except help with algae and stuff. And I've kept a betta with ghost shrimp for about 4 months before I gave them to a friend, because I didn't like em a lot and the betta didn't bother em at all. But thinks for the ideas I'll consider them.
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