What temp is your water at? Ideally it should be 65-68 degrees. Might need a chiller. A cheap thing to do for now would be to freeze water bottles to keep your reservoir chilled.
I’d also suggest to get a good ph meter if you dont already. Unfortunately, ph meter, especially with hydroponics, shouldn’t be the cheapest one cause ph makes all the difference. I cheaper out and it had really showed
Also, make sure there aren’t any light leaks either.
