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Most non-disposable plastics are fine, but for long term use with saltwater you want "polyethylene", or PE, and specifically "HDPE", which is higher density and more resistant to most common chemicals, UV light etc..
Buckets, including Home Depot, are HDPE.
"Food grade" is being misused in this thread. Brute trashcans are not designed for food processing... lol, but they are HDPE.
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80g Aiptasia dominated reef tank.. with fish and now a bunch of berghia!
Current Tank Info: 80g tank, re-starting a reef after a zoanthid nudibranch plauge, followed by months of steady and unstoppable STN/RTN, crashed; stayed FOWLR for a couple years, currently an aiptasia dominated reef tank with fishies and BERGHIA
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