You need to cut the silicone away and clean it with alcohol to completely dry the surface and remove the water that is in the joint as well. Next, fill the joint but ensure there are no air bubbles whatsoever. It is best to do with 2 people. 1 person filling and the other person watching from the outside to ensure no air bubbles are present while caulking. Use a silicone caulking applicator to push the silicone in place and create a nice clean bead. Wait a good 3 days before putting water back into the tank.
Honestly, a new tank is all ways a better option than trying to do repairs...
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