My 20 gallon shrimp tank was full of snails. I paid for expedited shipping of this item. I followed simple instructions. It says it may need to be renewed. I dosed this tank 4 times! Totally useless! NO DEAD SNAIL IN TANK. At the same time, the number of snails doubled. Now I have 10 predatory snails (snail eaters) in my aquarium, which they eat diligently. I don't know if they can eat them before they hatch. Just take a look. I'll let you know later. If that doesn't help, I drain it, clean it, refill it and start over. DO NOT BUY, THIS IS A REVIEW! THAT IS NOT POSSIBLE!
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