Ok so I have 4 of these in my 55g now. The reason for only 4 is that's all they had and wouldn't be getting any large ones in for awhile. I know they say to buy them bigger to lessen the chance of sickness and what not. I purchased them at 3 inches in length. I've done lots of reading about them and I know they will out grow the 55 but fear not, a 125 will be in my possession March of 2015. So for the time being the 55 should suffice correct? I'm keeping the water at 79 to 80 degrees and do two water changes a week. They are currently with my angels so water quality is a priority for this tank. Anything else I should do to make their stay more comfortable? This tank is driftwood and rock and very fine gravel cause I know they like to dig. I have various caves created with the rock for them to hide in. They are starting to come nout more now since they've been in the tank for 2 weeks. Thanks for any advice.