1. I'm not in CA, but from what I read it seems like raising tilapia in CA would be legally difficult. You do have other fish choices, such as catfish crappie,

1. I'm not in CA, but from what I read it seems like raising tilapia in CA would be legally difficult. You do have other fish choices, such as catfish crappie, perch, and bluegill. 2. I haven't been able to find a lot of hard facts about PVC, other than the fact that it supposedly bad for fish you want to eat eventually. In any case, PEX piping and fittings are readily available online and in Home Depot and Lowes stores.