It seems that just about everyone on this site uses a sump on their tank. I have been in this hobby for over 12 years with good success but I have never used a sump on my tank. I do have a hang on back pyramid skimmer that I would suspect hold about 3 gallons of water and an aquaclear 70 for filtration. This has been my tried and true method for filtration and I have not had many problems with maintain water quality. Can somebody give me some insight as to why a sump is better? I would love to have one but I do not have the space and need to keep the aesthetics of the room. Am I missing something cause I want to keep up with the hobby and provide the best filtration for my animals.