Hi reefers, I am planning a new tank, and was wondering about a design that would make WC easy. My idea is to have a drainage pipe at centre of bottom glass, and fit a pipe with ball valve. Above, place an egg crate, plastic sieve and topped off with No 3 sand. Over time, dirt will collect below egg crate via gravity. By opening valve, I will be able to change water and remove mulm. Will this work? I need to find method that will not aggravate my bad back. Thanks in advance.