Put in 3 crimson tides in with my RBP and they seem to be getting along, 2 days and they're all still around. The RBP are hitting around 8+ inches and the crimson are about 1+ inch. Nice to see them swim by each other without getting eaten. Hope this works, I've tried white clouds, jackdemp, ghost shrimp and snails but the crimson tides seem to be feeling at home. Got my fingers crossed.