I am delighted with this product. I've had a constant struggle with seaweed in several tanks, including throwing out the last one because I couldn't get ahead of the seaweed and was killing all the fish trying. Two months ago [4/6] I put two tablets in my 20 gallon tank half an hour apart. [take the charcoal out for a day] in two days the algae will be gone and WILL NOT RETURN AT ALL! I still don't have the algae eater. but I wonder what he would find to eat if I did. UPDATE 22/06 This week two Otocinclus catfish were clearly added.
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