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I have a cyano bacteria on my sand bed only. It's a very fine grain sand. About 2" deep. I have good flow with two wp-25s
I was thinking about vacuuming out all the sand cleaning it then putting it back. Any thoughts on this. Anyone got a better idea.
Try coral snow, worked for me, dosing weekly now and no sign of it returning, suction out what you can, took about 2/3 weeks for it to clear but all good now