I haven't read that they can fight (although I haven't done a ton of reading on these 2 so it is certainly possible)... so if you say you've read it I believe you Jaime.
Either way I like to believe anything is possible and that all fish are different.... why else would I put a passer angel in a reef tank, pretty much everything I have read says NO, but I have seen them in sps tanks so I figured give it a go. The worst thing that can happen (provided you watch them carefully) is that somethings gotta go
If you do decide to just get one or the other I suggest the bellus simply because I like seeing pairs of fish lol
All fish are different You may get a "model citizen" You may get a "monster" Just sticking with what the reading says. But thats the safe way so can be kinda boring. lol. I do know from watching my watanabi that she is the dominent one in the tank. So I can see some major aggression if another is introduced but that isn't always the rule. I have seen a bellus and a blackspot ( I think thats what its called) in a 20"x20" cube acting just fine. I know the bellus was a female not sure on the other.
Originally Posted by stunreefer
Mike, in your size tank you should have no issues establishing two species of Genicanthus. I would push you to add female(s) of both species though, as that would give both males "something to do", and create less of a territorial dispute in case the odd man out decides he wants a lady too!
You should have no issues with your existing angels either, I'm not sure how your pair is but some established multicolor pairs become quite aggressive, however normally only towards other Centropyge.
With that said get them from a very good source, ensure they are eating well and don't have any decompression issues, and QT the heck out of them. They're very commonly imported with decompression issues and flukes, flukes is easy to overcome, the other not so much. Of course, you'll want them to readily accept prepared foods so they can compete with your existing stock.
+1 on the getting a lady for both gents. lol And on the source too! I am not sure on your tank size but with enough room I am sure you can pull off just about anything Love my female great personality.