I have a question and my question is if you place a pre filer on your intake as I have two aquariums and both are 10 gallons and in both aquariums I am using the aqueon quiet flow power filters for the 10 gallon. I ordered these small intake pre filters off of amazon and they do only have one hole which is what I have heard is the best pre-filter to get for both aquariums and I washed them off and put them in my aquariums. I want to know if the filter is suppose to cover the intake entirely or just the bottom. I have included two pictures of the sponges in both aquariums. In one aquarium I just have a male betta who is always getting his tail stuck in the intake and that is why I originally bought the intake sponge and the other aquarium I just have 8 guppies in but they never seem to be bothered by the intake ever but I put one on it as well. Please help as I just learned about the pre-filter experience. Thanks.