RDWC Water HELP

Ok, Ya there is definitely light going into res. So the water was fine before I added the PH DOWN. After Adding PH Down + Light will cause this problem?

Hailmary said:

Ya there is definitely light going into res

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light leaks = algae = reservoir funk

In my experience, the first sign of algae is your ph will start to drop. If your monitoring it every day this will help but if there is light and nutes there will be algae. Black out everything and cover things with tinfoil.