It should be fine, one of my nems crawled up the side of my tank near my vortech before I went out of town a few weeks ago so I turned off the vortech and left since I didn't have time to deal with it. Once I got home a few days later, I noticed the same nem was missing so I started looking around for it. Come to find out it crawled half way into my overflow box and got beat to poop. It was all torn up and deflated looking. As I tried to pull it out of the overflow box, it broke into two pieces and one of the smaller piece fell into the overflow box. I managed to pull it out of the box and remove the other piece from the rim of the overflow as well. I placed both of them in the back of the tank by some rocks and within the first night, the bigger piece attached itself to the rock and started to heal. The smaller piece took a few days but it too healed and attached to a rock. So now I have 2 of them instead of 1 (well 4 nems now included my other 2). You'd be amaze at how much punishment these nems can take. You should check out the BRS video where they took a nem and cut it up in like 4 pieces and they all healed within a day and became 4 nems.