02-02-2010, 12:48 PM
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Here's the deal. Most puffers available to the aquarium trade are freshwater. Very few are brackish, and the rest are marine. Since were dealing with the brackish/fresh side to things, yes, most puffers are too aggressive to keep with other fish. There is one however that does well in a community setup, however they require lots of room, good filtration, peaceful tankmates, a steady supply of snails, and mostly they should never be alone. The amazon puffer can be kept in a community tank, however with you having livebearers and they prefer a much higher pH as opposed to what the amazon puffer prefers. So more than likely I'm going to assume you have harder basic water, which in turn would not be good for housing an amazon puffer.
They key thing is with puffers is that you have to design the tank around them.