Hard water stains

reefertank

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Hi guys,

How can I remove hard water stains from inside my tank?
20180322_193703.jpg
 
On the inside? Won't that have a negative effect on the water?
 
On the inside? Won't that have a negative effect on the water?
Yea on the inside, no one at all just make sure it's the original one not the one with chemicals. I've used it before on my acrylic tank to minimize scratches.
97ab5c56fe213cd6eda7dd4e370b2e94.jpg
 
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