the spots are just some lockout scars from ph swings... what concerns me more is the distance of yourr high quality growlight... its wayyyy to close
i got to look at the specifications again and come back
@Mrs_Larimar, yes, exactly, I change the solution (therefore not oxygenated) and 20h without oxygen. DWC is very thorough but does not allow any errors😢
Ok I checked the lights, these are high quality quanttum boards ( fullspectrum light)
the distaance at least to 65 cm------ aim growing with viparsoectra too, and i have to dimm my lights compared to other brands wiith same wattage.
@Mrs_Larimar, thanks for your advice. I just increased the distance. I will upload new photos soon, I would be grateful if you will give me new advice.