Ok remove the cloth, keep the same hours, and don't clean it yet.
Ok good. Now since the growth is where the light is, increase light to 22 hours. After a week, brush clean.
Yes go ahead. Have you ever used any ChemiClean?
whats that?
It removes cyano, which is bacteria. If you have not tried it, it might be a good experiment to see if removing certain bacteria will enable more scrubber growth.
i'll give it a try after waiting 1 week if its have growth or not
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