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Title: This product killed my fish
Review: Don't risk it! Pro Balance 7 Day Betta Blocks made by Penn-Plax no doubt killed my fish. I put a block in his bowl to test it before leaving on vacation. It killed an otherwise healthy betta within just a couple of hours. The tablet started dissolving quickly and putting off stuff in the water. It looked like my fish had been poisoned. He was in distress and could not swim or breathe and died right away.
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