This was funny to me, I have 5 rosy barbs in a 30 gallon walstad tank. They are active but mine do relax every so often, especially because in the afternoon for a few hours my lights go off (siesta lighting schedule), they end up taking a bit of a snooze as well.I’m afraid to stock my Walstead tank with anything after reading this. I’ve had many regrettable purchases, but the one that sticks with me are the dozen rosy barbs I put in a 55. They were the long-finned type and gorgeous. But hyperactive. Up, down, left right, zig, zag, EVERYWHERE ALL DAY AT 90 MILES PER HOUR. That was 25 years ago, and I still remember how anxiety producing they were.