Hey guys. I have an 18 gallon DWC with 3 air stones, T5 CFL ballast over it, top completely covered in foil. These seedlings have been in for about a week. My ph stays pretty constant until the algae comes. I know when I can't keep the ph down, algae is in full effect and I do a res change and wash, rinse and put back together everything. I thought maybe that some light was still gettin in through the hydroton so I cut squares of foil and put a whole in the middle to go around the seedlings so the foil covered almost all of the netty pot completely. Here is a pic and any advice is greatly appreciated.
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