What should I do??

[hillegom]

If the silicone is not loose and peeling I do not see a problem.
Take it outside and place the tank on some stryofoam on a level surface and fill with water.You will see if it leaks or not.

start from scratch you maybe able to use that rock as a base rock. If the silicone is not peeling or comming off it should be ok but themn again I reseal all my tank when they have been down for exstended times and any used tank I reseal. It's not hard and only takes less than a hour to do. better to be safe than sorry.

Bill