damn thats a huge difference. thays exactly what happened to mine. now mine are back on track after the bleach. you could also run 35% h2o2 if you are afraid of bleach. here are mine after getting them healthy again. these are with base nutes, calmag and a tiny amount of bleach in the res. i am now stopping the bleach in the feed res because i am reintroducing beneficial bacteria thats been brewed with kelp and molasses once a week or so.
blumats are known for producing mounds of roots outside of the grow media. mine will be there in a few weeks at this rate
Yea I think that the blumats are not delicate to the top of media vs sprayers. What is the application rate of the 35% of h202 and your application rate of bleach?