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Most all plastic parts (including a cutting board) have an material recycle identifier on the bottom in or below the triangle. It will be a number from 1 to 7 and likely several letters. PE means Polyethylene, PP is polypropylene, PETE is thermoplastic polyester (soda pop bottles), PVC is polyvinylchloride.
Your weld looks pretty good. Sometimes you can preheat the tank with a haridryer type hot air gun they use for paint stripping to get the tank a little warm before you start to weld and it will releave some molding stress. You can also do it after the welding to aneal the weld and make it more ductile.
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