Well its been 3 months since I got 2 black saddle backs. Both are alsmost similar size but you can tell that one is slightly bigger though. When they were in QT they didn't fight and when they are in DT the bigger one picks at the small one. And I wonder when this will stop its been going on for 3 months and the little guy is slightly beat up small rips on the tail and the bottom two fins, but he does the dance so I suppose he's submitting. And the big one won't let the small one swim in the bta during lights on but when lights out they share. Really when will they stop and just be a pair?