01-07-2010, 11:12 PM
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Even though your Amazon puffers are some of the most docile puffers out there, you may want to keep an eye on them, especially if you're putting the betta in there.
I'm not sure I'd try the gouramis since they're closely related to your betta, which could lead to aggression problems.
What about some docile, community-friendly cichlids? Of course there are a lot of different varieties of smaller cichlids (rams, kribensis, apistogramma, nannacara, etc.) but there are some larger ones that might work, too. There are lots of different species of geophagus that would probably work well and would make good use of your increased tank space.