Lighting adjustments for coral?

[bubba60tackle]

I have a 1 year old 220 gal tank. Threw a bunch of $20 frags in there a few months back. Some seem to be doing great, a few of these others not so much. Water parameters all seem to be fine. After doing some reading I’m thinking lights is either too high or too low, but I don’t know which. Light is an AI Blade Coral Grow. Posted my light settings, I do have glass tank lids in place as well.

 

[Mr. Mojo Rising]

You have only one fixture on your tank? The one fixture is not strong enough to light your size tank.

Renting a par meter from our LFS would be a good first step, just to know what par you have now, but I have no doubt it must be very low. The glass lid even further cuts the light penetration.