Originally Posted by MrWynO14
So this stuff should come off pretty good with a razor blade? What happens if some falls in the tank during the process?
If it's dry, you can cut under the silicone from each side (the two inside walls) and it should be possible to remove it as a single strip of caulk. If you drop a piece, simply "fish" it out - it won't instantly toxify your water. It will be much easier, and less potential for contamination of your water, if you remove if it once it's fully cured/dried (24 hours+).
There is no reason to re-seal the outside tank seam or remove caulk from the outside if you get a good bead/seal on the inside corner.
Good luck, should be simple fix!