Painting galvanized stock tank?


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Hi all! I was planning on getting a large poly stock tank for my goldfish but then someone gave me a galvanized one. Score! But it’s got a couple spots of rust. How should I seal them so they don’t get worse and are safe for fish? Would a paint like this be safe?
https://www.homedepot.com/p/100205766 or does anyone have a better product they have used with success?
 
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I did a bit more research. It Seems that fish don’t like zinc too much but people have luck with fish in them without treating. Maybe due to a bunch of plants absorbing it. Some chose to paint with pond armor. Some choose to use a pond liner. After determining that the process for applying the pond armor is a bit intense, I’ve decided to glue in a pond liner. This will be the easiest and safest for me.
 
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Wow, free is worth twice the price! Nice job. How large is the tank? The thing about rust is it doesn't go away so I would deal with it beforehand. How big and deep are the rust spots?
 
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Yes. I still need to deal with the rust. Hmm. They aren’t deep at all, approx 2” wide maybe. Just a couple. It’s an 8’ tank.
 
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