I'm worried that this might cause a health problem for them. They're Kuhli Loaches and look to be biting and pulling on the silicone part of it. The cave is made of pvc pipe, glass stones, and GE Silicone I Waterproof for Window/Door/Attic/Basement. I spent HOURS on this cave, so I would rather not just ditch it. I could put it in my 10 gal with my betta, but I would have to find something to fill that bare spot in my 25 to make my loaches feel safe.