Yes, his tank is established, but he lives kinda far away and getting a sqeezeing from his filter isn't really an option. My established 10 gallon does not have a filter w/ a biowheel at the moment (don't worry just ordered one) but the last two times I've changed the flter insert I threw that in the new one. Also my 13 gallon has a biowheel, but I don't wanna take a sqeeze out of that, cause it's a very newly set up tank and I used the biospira, and it hasn't worked very well for me so far, I think it would be useless.