I have redone a number of tanks over the years and I don't rightly recall any enjoyable experiences. The key to a re-do is clean glass, it is a very labor intensive job and if you want it done correctly you would be best to completly disassemble and re-do the whole thing, the only real positive is it does give you the opportunity to replace the front pane with a scratch free or starfire panel and possibly polised edges for a high end look. If you insist and want to tackle the job you will need:
-flat work surface large enough to accomadate the tank
-rolls of paper towel
-box of razor blades
-masking tape (hold panels in place once glued)
-rubbing alcohol and 00000 steel wool (to clean the seams)
-heat gun (optional, if you heat the glass while cleaning it works better)
-cheap silicone spatula (I have found this to work much better than using a finger to tool the corner seams)
-tube(s) of silicone (I use GE brand silicone 1, do not use silicone II)
-friend to help as you need to work reasonably quick
-box of bandaids
Be sure to work in a well ventilated area. Good luck, have fun
