GunkieBud

I'm useing hydroton , and using GH nutrients flora micro, flora bloom, like said this has been going on for 4 days I'd just pumped out the old nutrients , ran water Ph at 5.5 for 3 days then 1/2 strength nutrients every morning ph was high usually as high as 7.4, and at low end 6.8, PH it down to 5.4 to 5.6, 3 hours later it was back up in the 7.0's I can't figure this out, oh yeah by the way, the plant's are in 4" grodan blocks.