My tank sprung a leak, can i silicone overtop of seam to fix it?

[megs_clark]

Hi. I woke up to my tank leaking. Its a 72 gallon bowfront. The leak is coming from the bottom seam on the front middle of the bow. So my question is can i silicone overtop of the seam. Or do i have to take off the old silicon to do this. It looks like it would be hard to take the bottom out to do this. Would probably be even harder working with the bow. My boyfriend wants to just go overtop but i thought id ask to double check as i dont want to have another leak down the road. Any advice?