I've browsed this forum a lot and decided to start up a saltwater tank even though I won't be able to get the lionfish I have always wanted over here. I have been working with freshwater and brackish for years but I thought it might be fun to try coral instead or plants. I'm looking forward to the experience. I am considering using a 40-gallon tank to start. Do guys think that's a good beginner's size? I'll either put in overflow or use a canister filter but I've read mixed things about using canister filters