3 pairs are way to many for even a 55gal trade 2 lesser males in for your females. a common breeders rule: 2 females for each male. the best thing to do would be to have 2 females in with one male, after he breeds don't take the extra out he will trade off until he finds a worthy staple female. then you can take the extra con out. a tip: at walmart buy 2 of the smaller ceramic logs with the plant comming out, 2-3 various size aquarium safe flower pots, and one walmarts large ceramic logs they will breed in each until they find the best suited one. leave a few in for the female to hide if she needs to. as far as the female getting foods while tring to gard eggs I have seen my cans use 2 methods: A. the male will bring food in his mouyth to the female so she doesn't have to leave. B. the female will leave and gether a share of the food and the male will gaurd and they do this in shifts. to feed the fry they will bring and shred flakes in there mouths for the young. be warned, the parents can't do it on there own, you also have to give some fry food. with these tips convicts will take over your tank because of the fact that they never stop breeding. you can use a divider to separate the pair tempareraly if you need some time to grow/get rid of some of the fry at a lfs without distroying the pairs rituals for good