I do the low tech C02... bottle, sugar, yeast, etc. and I am using 2 t5 and one t8 lamp for a 46 gallon bowfront with a glass top. The lights sit on top of the glass top. I tried turning off the t8, but it seemed to make it worse, of course, that could have been just a coincidence and something else could have been making it worse, lol. I have eco-complete substrate, but I am not dosing Excel or anything.