Hello too all, It's been a'lil while since I logged on. I'm going to be starting up a 30gal. saltwater set-up for my son, I have a 400 Bio-wheel filter laying around that I'd like to use.My question is about the "end pins" on the wheel's itself. They are metal NOT PLASTIC. This complete set-up was freshwater.....Can I use these Bio-wheel's w/the metal end's on a saltwater set-up ?