For mixing SW
I would use the Rubbermaid BRUTE series. No chance of breakage. They make them in 20, 32, and 44 gallon sizes, you can get them at Home Depot, Lowe's, Menards, but I don't know if Wal-Mart carries them.
My tanks: 120 Reef w/L2 Algae Scrubber, 60 Reef Pond w/floating Algae Scrubber, 40 Breeder Reef w/L2 UAS Tester Algae Scrubber
I maintain: 144 SW Reef w/L2 Algae Scrubber | 200 SW Reef w/L4 Algae Scrubber
Special knowledge: Algae Scrubbers, Acrylic Fabrication