Senior cook is sabotaging food

I'm the newest cook at a sushi house – my senior coworker, who is a younger immigrant that doesn't speak much English, has been harassing me and making my job harder and I think it's 'cos he thinks I'm going to try to take his job. Last night during a rush, instead of focusing on his station, I found him trying to re-sauce my sushi and drown it in the process – I stopped him partway and he got pissed, but the massive puddle of spicy mayo on the edge of the left roll is the result. We share tips, so I always to try give the customer a great-looking roll with an appropriate amount of sauce. This pissed me off not just 'cos he shittied it up, but he was also focused on that while we were in the weeds. Should I say something to the head chef?