if you put in breeding OB's youwill have problems... Think of a college party full of guys and two girls... and it is legal to kill males who are in your way... trouble....
Plus obs are hybrids (I like them) and can mate with most any peacock and lots of haps... putting females with other males will likely result in tons of aggression and more unknown fry.. You will have trouble getting rid of tons of OB fry... a lot of keepers do not like them...
Lace rock is great, but you will not need tons, but a few caves is all... peacocks and haps prefer more open swimming space...