I'm wondering if it's possible to maintain two pairs of convicts in a 20 gallon tank. They are small right now, about 2" total length. Initially I added four, and they paired off immediately, but one pair died about a week later, three days apart. I believe the cause was aggression by the other pair defending their cave.
The tank had just a HOB filter, bare gravel and caves consisting of four flowerpots with 4" mouths and one piece of 3" PVC pipe about 5" long. The remaining pair has laid eggs for me three times in five weeks, with pretty much 100% survival rate (as far as I can tell).
I'm wondering if another pair of similar size could be added to this tank if I paid more attention to cover and obstructed sight lines. The purpose of this tank is to breed feeders, so all fry are removed about two days after hatch.
I'm not necessarily against adding a tank to accomodate another pair, except that there are already seven tanks and when I add up all the electrical ratings of stuff I have running I'm close to maxing out my breakers. I can just see myself plugging in one last filter and all the lights going out, or the house burning down
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