@Bongman, what are your temps like? High temperatures will limit the amount of oxygen the roots can absorb, so if you temperatures are about 20c, you'll need to supply more oxygen to the res. Looks like you're around 22-23c ait temperature, so that might not be the issue, but it's worth looking into.
Any issues I've had with roots so far have been fixed using either more oxygen (better pump, more airstones), and using hydroguard.
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