I spotted him halfway out of the hole with a flashlight. Then, I grabbed some tweezers which did nothing. He was holding on tight and running for cover. Then, I grabbed some chopsticks because he was sandwiched between the inside of the front overflow and inner second one. He fought hard but I scraped until he popped out. Whew! He had me scared for awhile since I wasn't sure how big he would turn out.
Victory is mine!!!!
He can definitely degrade acrylic or plastic but I would bet that he needs an opening already started. I doubt he could bore out acrylic-so Jin you are probably fine.