They're fabulous little guys, very inquisitive and brave! The boy was pecking at my hand when I was touching his plant pot!
In general I've got a very peaceful tank with 7 x h&t light tetras, 8 mixed corys, 2 female honey gourami, 7 otos, a flash pleco and about 7/8 mixed guppies. The otos are cheesed off with the spawning as that's where they all hang out. The honeys don't bother with anything, the corys don't bother anyone either. The tetras can be a little boisterous, but really only between each other and the guppies are no problem either although they've very active and greedy for food.
Even although they're spawning, the male is only aggressive to the point of chasing away any of the other lot. He doesn't give chase and attack.
I'd have a tank full of GBRs if I could. Only thing I would say is you should wait until your tank is quite mature and settled before venturing into rams.