Today I noticed some mild chasing, so now they are separated-better safe than sorry with these rather expensive, hard to find fish. I guess they were just stick next to each other for comfort until they got used to the tank. For now, I've split off 3 fish from my 75 into a 29 gallon including the flagtail. For their current sizes, it works, but it's a very temporary situation. Now the plan is to, as soon as possible (Thanksgiving/Christmastime?), set up my 120 (4X2X2) that I always forget about that's been in my garage (just need to get it to stop leaking) and divide my fish between the 120 and the 75 (one flagtail in each, obviously), and hopefully within a year, definitely 2, get a 6-8' tank and then upgrade everybody. (turtles to the 75, 75 fish to the 120, 120 fish to the 180+ and use the old 55 turtle tank as a sump for the big tank)