Grey hair algae. HELP!

Could be low nitrates, high light, etc... some tank parameters would be useful.

Currently dosing PPS-Pro

96w PC 6700k
20g long
using DIY CO2
Ehiem 2213 for filtration
0 ammonia - 0 Nitrites

You have a lot of light on your tank. You should have some Nitrates. Wonder if you're dosing enough for so much light?

i could always up it.
The issue with a 20g long is its 30 inches, and the longest light i've found so far is 21 (the bulb itself)
SO i had to go with the 96w, which has a 33 inch bulb.

Maybe you could hang your light over the tank so some of the light is lost and not as strong over your tank. Cut down on your photo period. Increase your Macro ferts so that you at least have 5 ppm Nitrates. You also need CO2 with that much light. Up your CO2. Make sure you have some fast growers in there. You could also use some floating plants to help cut down on your light.

Thanks TexGal. I'll see what i can do. and tell you how it does.