Hi Neo
Glad to see the zebs are settling well. The wee ones have certainly got their colour back after fishing them out of the bucket
The caves next to each other should be just fine at the moment, although as McEve says it could be an issue as they get older.
Shell, the theory is that the female pectorial fins are completely curved. The males, ( as I am hoping), tend to have a straighter edge as it leaves the body then cureves round.
rob