i think the only flaw i see, is ur egg crate on the sides of ur filter padding and bio pot scrubbies. it doesn't "force" the water down through it, if ur filter pad was to say get a lil messy water wont flow through as easily n look for other ways of letting gravity pull it down thus going out the sides through ur egg crates which would equal less filtering and dry bio media. unless im missing something when i look at ur pics.