A club for owners of Parrot Cichlids

Hi - I have 3 BPs and they are pretty rough/active. They are constantly digging and piling up rocks; uprooting plants (which they hate) and pusing rocks around with their heads. I am in the process of buying a larger tank for them and wondered if they will scratch the heck out of an acrylic tank or if that's an appropriate choice for this type of fish. I have 3 BPs (1 is 4" and the other 2 are almost 6" each). I also have a snail but he's pretty tame in comparison. Thanks for any advice on acrylic tanks!