Well if you are at 7 weeks of flower then you are about 10 day's away from cutting them anyway give or take a few. No point in adding CalMag anyway there is no time for the plant to recover if there is a problem anyway.

Good luck dude....Just know if you use RO water then you need to have CalMag Plus to put back nutrients removed from the water by the RO process. It's not a bad thing to use CalMag plus with RO water anyway.
Zandor Reviewed by Zandor on . CalMag with GH 3 part nutes The setup: Basically a bubbler / drip hybrid, my roots dangle into the reservoir which has an airstone. The grow is going great, we're in week 6.5 and my leaves have just started spotting (began last week and I understand this is normal), buds are shaping up nicely. I'm still giving full strength nutes with RO'd water and will begin a pH'd flush next week. I've never noticed anything that looks like trace mineral deficiency; the leaves have always been an even green tone... so are trace Rating: 5