Slate.........my opinion do 'not' silicone it down. Here is why I think that. I built a breeder system that has a total of 12 tanks just for breeding. I cut slate to fit. Siliconed the bajeebees out of it. A lot of work and money went into it. Well I had to pull all the tanks because I didn't paint the racking system that holds the tanks. Smart eh? Condensation and bare wood do not mix. Anyway.....when I pulled the tanks I notice that there was moisture between the bottom of the tank and the slate. So that means the water is getting thru. Tried cutting the silicone out. Ain't going to happen. Not sure what I am going to do. Anyway the tile I used was some left over from when I did the kitchen, bathroom and porch. I got to thinking.....Trace.....what?..........didn't you put sealer on the tile after you laid it on the floor? Yes I did, why?.......Because the slate in the aquariums don't have sealer on them, knot head. Oh.....your right. I siliconed the tanks because I didn't want to pull them out. Now I'd rather have the maintenance of pulling them out.
Now to your problem.... my guess is that the Axies are dying from the slate. Good chance that they have some type of sealer on them. I very much doubt it is the silicone. (if it is 100% rubber silicone) I know....Lock Tight has a silicone that states 'aquarium safe'. This does not mean other silicones are not safe. I made a post a long...........time ago about chemicals in our aquariums. See, to get the 'aquarium safe' label approved the company has to spend zillions of dollars for testing. If there is not a big enough market, not consumer based but commercial based, then it is not worth the cost of the testing. So a silicone the doesn't say 'aquarium safe' doesn't mean it isn't safe. They just do not want to pay the zillions of dollars for the testing because of the lack of "manufacturing" (opportunity) type sales. Volume that is .Not a 4 ounce tube here and there to your everyday Joe. Now.....let me go on the record....I DID NOT SAY TO GO AHEAD AND USE ANY SILICONE YOU WISH. I merely stated my OPINION about the different so called gradings of silicones. So if your Axies are dying it is not cause of me. Now........after I went thru this nightmare, I thought to my self.....have the bottom sand blasted to obtain a rough surface. That would be way too easy.
I would get the Axies out of there asap and get the slate away from the tanks. I hope you solve your problem.
I do want to ask you a couple of questions...#1 the silicone that you are using, is it 100% rubber silicone or is it some type of silicone latex blend?....(no blends) #2 Why the slate? For breeding purposes or just for decor?
Trace :animal: