These are my preliminary plans of the DIY wet/dry filter I want to make for my soon to be built custom 140 gallon tank. Would this work fine or am I missing something in my designs. Also, I plan to build a replica London phone booth where the top half will be the fish tank (don't ask where I get my ideas as I not sure myself). I estimate the tank will be 2.5 feet x 2.5 feet x 3 feet deep and I am really unsure if this is a good thing... I see most commercial tanks are not much deeper than 18" and are usually long instead of tall, any reason for this besides being able to reach the bottom of the tank easier for cleaning/maintenance? Any comments, advice, tips etc would be greatly appreciated as I am new to this and would like to avoid any grief and do it right the first time.