Hi! I bought a 20lb bag at Petco and it was good for my 45 gallon. I would have like just a little bit more, so I would round up when you are doing yours. I would think three bags would be good for you, but it also depends on the base dimensions of your tank in comparison to mine.
answered 1 year, 7 months ago
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about 5 or 6 bags
answered 1 year, 8 months ago
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