I've got a 67g tank with 12 harlequin rasboras, 5 angelfish, 3 mollies (1m, 2f), and 1 dwarf gourami (named Cedric). The tank is lightly planted, with rock piles/caves on opposite ends of the tank and also a bit of a hiding spot made from a couple rocks with a piece of (fake) driftwood in the back of the tank, in between those rock piles.
The male molly is, as stated in the subject, a really big jerk. From this point on, I will refer to him as Molly-o (think Mario...), because that's his name. I had 2 dwarf gouramis, and Molly-o would pester both of them incessantly. The one dwarf gourami died a couple weeks ago, and I thought maybe he died as a result of being pestered so much (it seemed Molly-o always targeted one more than the other). After that, Molly-o left Cedric alone a bit, but I have still seen him pestering him occasionally. Chasing, pecking/nipping, just being overall annoying.
All of a sudden this morning I spotted Molly-o chasing and pestering one of my angelfish, which is something I'd never seen before. There have been a couple times where Molly-o has started to approach the angels, but they've always managed to stare him down until he turns and goes away. This morning though, he targeted one of them and for whatever reason, wouldn't back down so then he was chasing and nipping at that one... now that angel look like it's on the verge of death. It's just lying on the gravel and looks to be panting.
The question is... if I add more female mollies, will that alleviate the situation a bit? Or at this point, do I take him back to the store in exchange for another male molly? Or is this behaviour typical of male mollies (in which case, I'll just take him back to the store and not get another male)?
And a side question... what do I do about the dying angelfish? Leave it there and hope it gets back up again? I don't have another tank at home that I can move it to...