Glass cover over tank with MH & PC bulbs

[Crit21]

I was considering putting glass over my 125G to slow the evap rate. I have MH and PCs (with fans) about 6" above the tank. Any major concers regarding trapping too much heat in the tank?

[racer69]

If you have an open sump, you should be fine. If you don't, you will have a major heat increase, and not enough gas exchange.

[Crit21]

I'll have an open sump under the tank, but the cabinet will be pretty much enclosed though. I may have to add a small fan to aid cooling.