What the heck is a T-5 bulb?

[Bob I]

when I sqitched to the HQI MH set up my growth trippled and my colors got more intense. so I will not say you need MH to keep any coral, but I will say you might need MH to give the corals the best possable enviorment we can. After all is it right to keep a living creature in conditions that are below what we have the ability to offer?

The only thing I want to add here is that I do prefer the look of MH lighting as in the ripple effect. I don't like the cost of running them. On my little 50 I would need two 175W lights, and I am not prepared to pay the cost of running them.

I also recall Brad complaining in another post that one of his Acros grows too fast. Therefore, I would propose looking for a happy medium by giving them a little less light so that one does not run out of real estate so quickly.