I currently am running 3 Penguin Bio-Wheels on my various tanks. I like the bio-wheel concept and have been relatively happy with their performance thus far. But a couple weeks ago I got an AquaClear to supplement my 55. I'm liking it's quieter operation (less splashing noise than the bio-wheels) and I feel it has more "sucking" power than the equally rated Penguin. So....I'm contemplating switching my Penguins over to AquaClears. But I want to get opinions on which filter you all think is best. So pick your filter of choice and if you have reasons why or what you like/dislike about one or the other I'd like to know about it! 
