That’s actually what I used it was a 55gallon tote from Home Depot I put a ratchet strap around it for extra support as it started to bow but worked perfectlyI am just learning salt water but for freshwater I use the black totes from sams club/home depot/lowes/etc. They are cheapest at Sams, a 40 gallon is $15. I have filled them but prefer 2/3 full, the bow out a bit but hold well. I used a 27 for a temporary freshwater sump and never replaced it because it is working well for last 18 months and only cost $7. Again, need help onowing if safe for saltwater but I would think just as safe as kiddie pool and you can use it after to store supplies.