I've had mine for about 10 months now and have been struggling with GDA but I was running my intensity ramping up to 80%, 100% peaks throughout the day. I've backed off to 70% and am still getting some GDA on the glass. Just recently I changed the settings to go no higher than 40% intensity to see if that help avoid GDA.
During this time I've tried different levels of dry ferts (NPK), and dry micros with the same GDA no matter what I did.
Weely 50% water changes do not help.
No ferts after huge water change seems to slow the GDA down but then the plants suffer too.
What I cannot figure out is how it is possible to grow plants that need high light if it just grows algae. I now wondering if I should have just kept my 5, 40 watt T12's instead.
55 gallon Clarity Plus (acrylic tank with euro style acrylic top - cutouts for light).
Tank is 48" wide and 24" high, about 3 inches of black sand blasting sand.
My 2 Kessil A360X units are mounted to lamp shades making them about 8" above tank top).
20 gallon sump in basement with CO2 reactor.
Added two tunze powerheads to beef up water flow about 4 months ago and doesn't seem to help with GDA.
I'm starting to realize from reading what other have done that we should go no higher than 40% intensity with these lights.