They work well and protect my 55 gallon and 30 gallon tanks from algae. I do regular cleaning and water changes and treat my aquariums with this product every two months. The warnings on these tablets are scary but none of my fish were hurt. When I have heavy algae on my plastic plants or decorations I put it in a bucket, treat with a tablet and let it sit for a few days and it seems to help. No complaints.
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