Hey Scroglodyte. Thanks, Yeah I ph'd my rockwool. I don't think I've been over watering them as I wait until the wool is getting quite dry.
Martybutch - Thank you, Hopefully it was just heat stress. The heat in my tent increased drastically when I turn on the hps and I am having to keep my doors open until I get a air-cooled hood. I currently have the HPS about 2 ft above them as I read that this was best for the plants until they have grown to around their 3rd node. Now that I have controlled the temperature. Do you think this should be disaster adverted?