Im thinking of selling my MH and going T5. My question is how many bulbs of t5 HO bulbs would I need. The tank is 24" long and 18" front to back, but it is a inwall so really its more like 15" front to back. Would a 24" 4 bulb fixture do the trick. In the tank I have shrooms, yumas, frogspawn, hammer, a clam and a couple others.