I don't know what's inside but it turned my lively and thriving aquarium into a graveyard in less than a week. I used 3 balls in a 20 gallon aquarium. For 3 days all my blue puzzle snails were lethargic and didn't eat. The very tips of their shells now have a rough edge. Within a week they were all dead, and their poor little meaty bits were falling off the shell. So far the fish are fine but I'm not hopeful.
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