A 4 bulb t5ho would be iffy for sps
and nems. I tried it on my 36 gal
and they all died. If the unit had individual reflectors it would he doable for less light demanding sps
For t5ho units, it is either 6 or 8 bulb units that can support sps
and they can be pricey without bulbs for coral growth. Because of this, i usually recommend the taotronics leds that can be found on ebay. It is a simple led
unit that you hand above your tank. The best part about them is that they are around 200 in price, the price of 4 bulb and lower quality 6 bulb t5ho units. Ill post a link when i get to my computer.