um, you said you would wait until he settles in to see if its male or female.....you could have checked while putting him in by venting him.... just an fyi lol, its alot easier to check outside the tank than it is when there in there.
Yep they will fight a bit but as long as you break the rock zones up it shouldn't get out of hand to bad, I had mine for a while they did fine.. I have some nice size Cylindricus coming too me from Atlantis here by Tuesday i just couldn't resist it as i really like these guys..