I have a group of 5, between 3-5 inches. They are currently living together in a 30 long, with a stray, odd botia that was sold to me by petsmart as a skunk loach, but when I got the bag home, one didn't have the back stripe and appeared longer and skinnier. The stray was happier with the Modestas than the skunks, so he was adopted by them. They're facinating little goofs, staring out at me with their big eyes. They're sorta paranoid and only come out briefly to eat, but when the lights go out, all hell breaks loose. I want to get a blue light so I can see just what they're up to. The biggest problem I've had is them jumping into the hang on back filter, but they are never hurt. I just stretched some netting from a produce bag under the out-flow and haven't had the problem since.