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help with cleaning a new used tank

1K views 1 reply 2 participants last post by  horsemen 
#1 ·
Today I bought a used 30 gal tank. It has everything with it: tank, hood, light, pump, filter, rocks and plants. This is a fresh water tank. I need to know how what products to use to clean the lime and buildup off of it. A friend told me to use CLR, but I dont know if I can or not. Please help.
 
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