I bought a hang on back filter for my small 10 gallon aquarium . I have a hang on back filter which have only space for two carbon plates. Its been sometime I need to replace the carbon with sponge. But the place is small. It can fit two 2 inch width and may be 5 inch length sponge vertically. I want to know will it hold enough beneficial bacteria for a fully loaded aquarium or I need to buy a different filter with more sponge. I bought it because I thought It will not brake my glass while hanging loaded with water. Guys tell me what to do?