Thanks, Weedhound. Yeah I have the chart for the various nutrients and their proper ph ranges etc. and have been keeping it at 5.8 as perfectly as I can. This rapid dropping thing is a new one.

It's at 5.7 now.

When I rearrange my room this evening, I'll raise up my grow tub a few inches so the system will hold overall a bit more water. Should make it more stable in general, and keep water temps cooler too.

Despite it all, the plants are doing well, crowding each other, showing pre-flowers and starting to give me a nice smell
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