I just purchased the AquaClear 20 filter with foam sponge insert, activated Charcoal, and Bio Max media bag. I have a 5 gallon Aquarium with Betta fish, Pleco, and Gold Mystery Snails. I love this filter, I researched online which would be the best filter to purchase on the market today and the AqauClear was number one on a ton of websites. My water was cloudy but the AquaClear cleared it up in a matter of a few hours. I would like to hear from my fellow members which filter do you believe is the best for your bio load in your aquarium? Which filter keeps the water crystal clear all the time? What size aquariums you have, what inhabitants, and if you have dual filters, under gravel filters etc?