Have used the large (55 gallon) rubbermaids as sumps for the last 2 years, and have a system that has had one going for the last 18 months without any huge problems.
If you are going to fill it more than 3/4 I would advise 2 x 4 or something to brace the top.
Make sure you take time to get the cover to fit properly.
Zulu
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