Yes I use RO water, some calmag as recommended (a little less than 5ml/gal actually), and weak gh 3 part nutrients. 5ml each per gallon currently.

I recently added a 400wMH and my water temp has gone up too high, does that create a PH issue?

My plan already for today is to drain the system, relocate my res to a new location which I've tested as several degrees cooler. But I dont know if thats related to ph. I also planned to go to latewoods feeding schedule which will be somewhat stronger nutrients.
MisterE Reviewed by MisterE on . PH Dropping quickly? I'm sorry to post this question, I tried to search but the term "PH" is too short for the boards search function... I'm having to PH Up my nutes more frequently as my plants grow. I'm wondering if this is considered normal, or if it is indicitive of any actual problems etc. I only use 8 to 10 gallons or so total (going to change it out and measure carefully today) and the plants are only about 10 inches tall, on their 8th node. I calibrated my continuous meter yesterday, and PH Up'd to Rating: 5