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Good biological filtration medium!
posted 6 years ago
I used this in my 5-gal. and 10-gal. aquariums. For the period in which I used them in my aquariums, I did not experience any significant health or water quality issues. I did find the shape to be a little bit problematic, as they had an odd tendency to get wedged into things, or on the other hand, wouldn't fit right. Even still,this is an excellent product.
Pros: Worked well!
Cons: Shape is a little challenging
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