I developed kelp in a tank and adding Phosguard to the HOB filter eliminated it. I placed the tiny pellets in old nylon tubing, tied them off and placed them in the cooktop to allow the water to flow through. Replace every 4 days and the seaweed will be gone in a few weeks. The directions aren't the best, but the Seachem website says to use 1 2/3 teaspoons for 10-20 gallons, 3 2/3 for 20-40 gallons, 3 1/3 for 60-200 gallons if that is the case. will help someone. .
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