Nice frag tank - this is just a suggestion but why don't you make a sump for it - put an internal overflow right in the middle and have some spray bars return the water. By the time you put everything in the frag tank you might run out of real estate, JMHO. You can put everything in your sump get a 20 gallon long - even add an AS (beat snake to this one). I am currently drawing up a frag tank about 24 by 48 by 12 high - I want to put an overflow smak in the middle.