They are very tough. the one in the pic looks like the 300 gal size. i have 2 of those, 8 5o gals and 4 100 gal. You can get them from agway or tractor supply co. the 50's cost about 65-75 bucks. the 100 gal costs about 85 bucks and the 300 gal is about 250 bucks.