09-09-2007, 06:46 PM
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Bioload on pygmies is about 2 fish per gallon, so if you were only going to keep pygmies in there, you could have as many as 60 or 70. I would recommend taking some of that space for 3 or maybe 5 ottos, and half the rest for a school of peaceful tetras. So you wouldn't have any problem with 20 or 30 pygmies.
So far as I can tell they're entirely peaceful, so rival schools you won't get. You may see multiple groups, but they'll be pretty fluid, and if you're more than doubling the number in there, I would thing the current population would simply assimilate into the new population. Might take a week or two, but you won't have any problems.