i fix it almost every day.. it gets like that after 2 days. I clean it all the time, and also watch him when he eats and make sure he eats it. We got him new food which he likes a lot better now.. and also I am trying the plastic wrap for the first time right now and seeing how it goes.. I cleaned it again tonight and right now it is very clear again.. I never let it last long at all like that.. so far it seems the film is less. Thanks guys :) And I will also consider a bigger tank but it is bigger than it looks in those particular pictures :P