AbroCadabro

you should have put something over the rockwool to block light from hitting it, I'm pretty sure that's what caused all your problems a piece of aluminum foil would have done the trick

Good luck and happy growing :blush:

Dude I just noticed you aren't using any bennies! I had issues from day one without some beneficial bacteria. Once I started learning about them was when everything just started working and really has never failed. Now you can go many ways like sterile, however I have learned that its much easier to go with the flow/nature. There is a few different products like Hydroguard but its way to expensive here in Canada. I have tried Pond Sludge Remover which was beneficial bacteria from amazon for cheap, it worked surprisingly well. After trying Great White by Plant Revolution, never tried anything else. I use very little every reservoir change and even though its a bit pricey I never have root rot. Now my reservoir never made it to 90, but 85 yes. Its been a total game changer! Oh one note, BB's only really work with synthetic nutrients so stay away from organic stuff, its not the end of the world.:smiley::facepunch: