Help Me Determine What's Going On. DWC.PICS INCLUDED....

So I posed this question in the dwc section but it got no replies with over 100 views. So I'm on my first attempt at a dwc. My last reservoir change was on 4/29 but since then my ppm has had a drastic drop. My ph has risen slightly but only to 6.0-6.1. The plant looks healthy and has budsites everywhere and isn't showing any signs of issues. Roots are bright white, water has a slight discoloration from fox farm nutes and the plant is green without any noticeable deficiencies. I'm wondering if its normal for the ppm to drop so drastically, so fast? Since my last reservoir change my ppm has dropped by 900-1000ppm and is almost reading what my tap water should. Has anyone ever had this issue or is it normal for my plant to suck up the nutrients so fast? I've included a pic of the plant from yesterday, a root shot from last reservoir change and a root shot from one weeks ago. You can see the root growth. Anyone know why this is happening? Just finished day 21 of 12/12. Or is this not an issue?

Looks under fed bro, a plant with that many branches could need more food , flowering nutes with N. Also drop the ph to 5.8.

But why is the ppm dropping so fast? It's dropped by 900-1000ppm in only 4 days.

joe blow greenthumb said:

But why is the ppm dropping so fast? It's dropped by 900-1000ppm in only 4 days.

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Looking at the plant my guess is it is consuming them. Until a grow guru can come along with a different answer as long as your plants look that good just give them more food they are asking for it. During the first 2-3 weeks of flower my plants seem to really gobble nutrient. I also leave them on veg nutrient for the first 2 weeks of flower. Then I swap out.