[Lance]

Originally Posted by globaldesigns

I agree with Doug, why not use bulbs that give more par value, Figi's and blue bulbs enough blue/purples in coral, but IMO do not give the light par value that would enhance growth, and what clams would use.

Before spending money on changing the fixtures, I would suggest just trying a different bulb combo, replacing maybe one or two bulbs only for now. See how that goes.

I am a fan of the MH, but I must say many of you have gorgeous setups and happy coral with only T5HO, so getting the right config and right number of bulbs is the key here. I wouldn't just change to MH, just yet, if you don't need to.

I agree with Doug and Sphelps. I think you have enough light now on an 18" tank. Before you go and buy a new fixture try some other bulbs. More bulbs in the 10000K range and you should have plenty of the right light.