i bought mine from the local pool store for about $12 per 50 pound bag. you will need 2 bags for your 180
to clean it dump the pfs in a 5 gallon bucket and run a hose in it untill the water runs clear (do this outside)
it is real easy to clean and i think it looks awesome
Mike. Look how small his fish are. Of course they can't kick up PFS. I had PFS with 14-16" cichla and they kicked it up. And got into my filters. Go with tile
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