The Penguin Bio-wheel 200 that is starting to die...It is low quality and cheap. What is a good (and preferably below $50 dollar) filter for a 30 gallon heavily planted tank? I am sort of a filter noob, so if a good filter can't be bought below this price, just let me know :grin2:. I am interested in trying a canister filter for the first time, but they are so much more expensive. what are the pros and cons for a canister filter?