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Hi all
First grow with rockwoll. Feeding twice a day by hand, was getting cupping and yellowing leaves, backed off on the watering and did my watering by weight of each 6" cube. My PPM is 750-800, temp 80-88 w cos, 6 1000, ph 5.9. I back off on the watering and did it by weight if they were light I watered. I have noticed new root development and less alge on the tops, but I have htis issue now
6 - 1k lamps??? 80-88 degrees is not too hot, IMO....
The rockwool was your first mistake....but that too is just IMO....
CGI::::::
When having issues, it's always best to fill-out the troubleshooting form. This is especially true if plants are fading fast or if you're panicking, as it can take DAYS to drag all the pertinent info out of the grower.
Just from the description it sounds like low ph. But it's a guess since we don't have all the info.