My hydro plants are a few weeks old and I have noticed a green substance forming on top each of the rockwool cubes which don't get fully submerged by water. I am assuming it is a mold. What is causing this? Is this normal? How can it be removed? How can it be prevented? Thanks in advance dudes!
light+exposed wet rockwool = definite mold. atleast thats what i've alawys been told. so bury your rockwool asap, don't let light get to it. you could probably nipp off the moldy parts? im not sure
