I didn't use hot glue, I used aquarium silicone. ut a thick layer on both land and water sides of the plexi. As said a couple posts down, I think it's the fogger evaporating the water and making the coconut bedding too damp so the water I'm getting on the land side is the water through the top of the soil. I will test it tomorrow and see.
:I mean these glue are pretty tuff. I assume you use the rubber glue or something similar, right, that they use for making aquarium. You put it in the glue gun which basicly melt it down. My beautiful girlfriend use it all the time for arts and crafts. She's a pretty good painter, too.