My suggestion would be not to do any water changes untill the cyno has gone. The cyno uses nutrients from the water column and light to grow, everytime you change water you are proving fresh nutrients for it to grow.
Okay, make sense, and I have a special black sheet that is only for this purpose. Doubled up it keeps light away. Will I be feeding any left over cyno, by doing a WC after the lights out?
Originally Posted by Manoj's Reef
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