So I recently finished a project a 55 gallon with plexiglass separating 2/3 with land and than then 1/3 water, a small water pump pumping water from one side into the dirt and up to the far side running down into a creek back into the water section. Now this is what I need help with so I wasn’t paying any attention at all when I sealed everything and I used GE Silicone 2 totally spacing that it could harm my fish as I have only used GE Silicone 1 in the past. Now I used it to lock in the plexiglass plate dividing land and water and also to coat the top of the clay I used for the creek to make it waterproof, I didn’t put any thought into it until I moved a couple of my fish from my other tank into this one and after about 15 minutes were completely dead, I treated the water before I added them and was confused until I thought about the sealer now what I need help with is should I just go back over everything with GE silicone 1, the creek and plexiglass divider or am I just **** lol. I’m thinking I should just cover everything that I sealed with the GE 1 and it should be all good. What do you guys think/recommend?