DOES NOT TRANSFER VERY MUCH WATER. I AM NOT SURE BUT NO MATTER WHAT I DID TO KEEP IT CLEAN MANY WATER CHANGES COST ME A TON OF MONEY TO DIE FISH AND CHEMICALS HARD TO UNDERSTAND I DON'T UNDERSTAND WHY IT BUT I HAVE AMAZING WATER. Since taking it out I've just added an extra filter so don't waste your money on that. I've lost a lot of my fish, just install an extra filter if you have a problem
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