I know this might be a little off topic however i cant find any information on the internet about this.... Im making a sump for my new set up which is going to be an aquascape at the moment and possibly a marine tank in the future .... so here in lies the question i was at my LFS and he said the PVC has to be a specific type for marine because the normal goes brittle after a while and he pointed me to a specific web site (http://www.coralculture.co.uk/shop/index.php?cPath=157) where to get this type of PVC however everything i read and look up nothing mentions marine setups needing a specific type of PVC so I guess Im wondering if this is true or not?