Thanks to my knowledge gained in practice, this Bio Block is a total letdown .Despite the promises on the package, it barely makes a difference in my aquarium and actually worsens the water quality. i purchased it in the Pet Supplies section and wasted my money. The concept is good, but the execution is poor, leading to a negative impact on the environment. The only pro is the size, which fits well in my filter, but that's not enough to save this product..
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