my brain just hatched an idea that i think needs to be subjected to scrutiny from people here at MFK (i want to hear your opinions). i think i could make a giant canister filter with the basic design of a sump but just cover it with a piece of glass and have a silicone ring that you put along the edge of the lid. then you silicone some little hooks on the side of the tank u use and get some more hooks screwed in and sealed in the glass so when you hook them to the other hooks it closes the silicone for a hopefully water tight seal. ill post a drawing later but its kinda like those jars with the rubber that seals when the metal hook closes over the other hook. if you know what i mean. tell me what you think or dont get and ill try to explain it.