fixture

Hello everyone I have setup a 30 gallon long tank (3ft) at my son's school. The tank was setup by contributing what we had in surplus or could spare. Someone gave the tank, other filter, gravel etc. Some forum members were very kind to contribute with plants. I am now looking for a Coralife...

I just set up my 29 gallon SW tank a little less than a week ago and am looking for some proper lighting. The tank itself is 30" long so I'm wondering what the appropriate length for my lighting fixture should be? From what I've gathered it should be 24" So if anyone can help me out or knows of...