Recently bought 4 nice 3 bar IT datnoids around 5-6”. Keeping them in a 180 gal. Two are very active and stable, and two are less stable and like to hide on their side in the corners or behind the heater/filter tubes. I don’t see a lot of aggression, maybe a little chasing now and then. Any ideas to make everyone active and stable? Was thinking adding two more days or maybe a school of clown loaches or something. Thanks - Nick