Hello all don’t know what’s going on lost 4 last one turning yellow I’m following “dyna grow” instruction for a 5 gallon holding tank, light is a 300watt full spectrum led. The feed cycle is 15mins every six hours plant is in a Rockwool starter cube inside a Rockwool 4in cube surrounded in clay pebbles, there is a bubbler in tank and ph. is 5.7 to 6.0. Also the light is 22in from top of the bucket, I did have a 1000watt Hid (MH) lamp but heat in room was too high with it on.