Well this is a grow out 75 gallon tank. I have heard & I believe it is good to have pups in a tank this size so they have an easier time eating. It is running with 2 AC 110's. One of them completely full of media only. The other has a sponge pad, sponge, carbon & media. It may be a bit under filtration with the bio load of this group, but I check the water & change 70-80% every 5-7 days & all the parameters stay good. It won't be long until they grow & end up moving into my 180 gallon. (I also have a 850 gallon tank being built as we speak!!!!)