I have a Whisper Power Filter 60 for my 55 gallon tank (has two carbon filter media compartments and clips onto the tank). I just bought a new canister filter - Eheim 4+ Pro 250. I have a planted aquarium with two angelfish (app. 2.5" from top to bottom fins) and 6 very small Siamese Algae Eaters that will grow to about an inch in length. I'm adding 10 assassin snails to deal with a moderate invasive snail problem. Should I ditch the Whisper filter or is it better to keep them both?