@subzero - Yes that does help quite a bit. I have no idea about the limescale honestly. My tent poles are not PVC they are metal with white powder coating finishing on them. The tent is newer, purchased in fall of 08'. I don't think its a poisoning situation because I think all my prior plant problems could easily be explained as overnute. What is oxy plus and how much do you suggest I dilute it down, and now much should I use per gallon or liter? I treated the rockwool with PH5.6 water and 1/2 strength Ionic Bloom. About the lights, the T5 metal halides, I'll have to confirm with the store but its well over 1000w of lumins I believe and my ballast can hold 8 of them. I'm currently only using 4 and the ballast is slightly over 3 feet above the plants. I believe I had it to low to start and they started showing signs of either heat stress or over lighting so I raised the light up significantly and they are looking much better now. About the HPS T5, I don't believe the are actually called HPS but they do give off red spectrum of light, but at a higher lumin count and produce less heat. Again, I need to figure all that out but I've been lazy about that part to be honest. Normally I start my seedlings off with a 400w light but the spot I had it hanging from got some water dmg and i haven't replaced that overhead yet so I put them directly in the tent from seed which was my mistake. And lastly, I've been running the Ionic at [email protected] wich roughly equates to 1/2 tsp. per gallon which I'd say is roughly 3ml per gallon which would be less but I've also been going 50/50 calmag/ionic grow. I am going to pump about 15-20gal. (I'm just about 38gal. total right now) and I'll stop using the CalMag and put myself at about [email protected] with only tap and ionic grow. Also, what is your tap at sub? Mine is at [email protected] if you didn't catch that from my earlier posts. Lastly, could you please tell me your nute schedule and approx. ppm per week and when you swap, you seem to be the only person here other than me that uses Ionic and I'd personally like to hear what your nute schedule is considering you are using it successfully.

Lastly, does anyone have any suggestions on how to clean hydroton properly if you DON'T have a high pressure water sprayer? I don't know if I want to throw it in a sweater bag and put it in my dishwasher because my dishwasher blows ass.