Hey tandy, you might need to take the pleco out. It's rasping teeth will wear down the liner. If they damage acrylic, a liner will be nothing. Especially at it's size.
You have down a wonderful job!! It's not easy trying to smooth out a pond liner. I used a liner in a rubbermaid 100 gallon stock oval in shape. The liner is not smooth.
I can sympathize with the hot water too. After filling up the 100, I had no hot water to do water changes on the other 6 tanks. Even after 45 mins. had lukewarm water and could only do 3.

You have down a wonderful job!! It's not easy trying to smooth out a pond liner. I used a liner in a rubbermaid 100 gallon stock oval in shape. The liner is not smooth.
I can sympathize with the hot water too. After filling up the 100, I had no hot water to do water changes on the other 6 tanks. Even after 45 mins. had lukewarm water and could only do 3.