I was going to say..dude, run beneficials or you are going to have problems..and there is a post about hydro sparkle.
I would LOVE to run a sterile system but after time and time again of getting rot, I went to beneficial teas and never had a problem. It has allot to do with what is in your water to begin with.
I have never heard people running into rot with beneficial and the OG stuff is the bomb. Ok the other hand, I have heard people clearing up rot with simply h3o. Just never worked for me.
So how are you chilling your buckets? Are you circulating the water from the chilled Rez to the buckets?
My only suggestions at this point..buy a pond master or Alita air pump. The eco plus commercial pumps are garbage and I mean hot loud garbage.
Skip the drywall if you can. Plywood and
panda film are lighter, cleaner, and don't rot.
Good luck and have fun!!