Thanks so much.GE 100% Silicone. They have it at Home Depot
GE Silicone I All Purpose Caulk, 10.1 Oz. Tube, Clear, GE012A https://www.amazon.com/dp/B0000CBIH9/ref=cm_sw_r_cp_api_i_qf7kCbNX4XZRH
I’d let it dry for 2-3 days in room temp before putting it in the tank.
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