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Title: Health hazard to your fish
Review: I normally don't leave reviews but I feel so strongly about this product that I felt the need to contribute my warnings to the already numerous warnings on here: Do Not Use This!I left a block with my betta over Spring break (only 7 days). When I came back, there was green, powdery gunk all around the remnants of the block. Luckily, my betta looked okay and the ammonia levels weren't that bad - which I attribute to all the aquatic plants I have in the tank. I feel like if I didn't have the plants to reduce the ammonia, I would have come back to a dead betta.
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