I see.
The reason I ask is because i just recently made a fry pile out of coral rocks from a recent trip to the beach. I then siliconed them to a flat piece of plexiglass and let it cure.
yesterday i placed it into my pond outside so all the excess salt could soak out, and plus i didnt want to directly place it into my cichlid tank in case the silicone hadnt cured properly, so i used the pond to test it out first. I figured after a couple of days i would take it out, rinse it well then place it into the main tank.