Planted Tank Enthusiast
Join Date: Apr 2012
Location: Edmonton, Canada
You have to break the silicone seal between the glass and the plastic rim, peal off the plastic in chunks and then scrape the rest of the silicone off. Razor blades are your best friend.
Before de-rimming a tank have a look at the upright silicone job, just to make sure it isn't too ugly. The whole point of taking off the rim is to make the tank look nicer, sometimes the amount of silicone used on the joints can be fairly ugly.