How big are the Rainbows? I know they can have a pretty high body as they mature, but I wouldn't trust them with larger Polys like a Weeksii, Ornate, and/or most Lower Jaw species.
+1 the rainbows could be good for life if the circumstances are good. If their body is big and deep enough and the polys are small enough, but then again theres nothing saying the polys won't try and take a bite. Everything else should be good, the only other thing that maybe be a question mark is the cutteri (from what i've read) they are just like the rainbows and depending on their size and the polys size will depend on how long they live assuming the polys don't try and take a bite out of them.How big are the Rainbows? I know they can have a pretty high body as they mature, but I wouldn't trust them with larger Polys like a Weeksii, Ornate, and/or most Lower Jaw species.