Red Sea Sump Modification Kit is the Ultimate Silicone Cutting Tool

[Reef Builders]

The Red Sea Sump Modification kit is a very useful accessory for removing glass partitions that are siliconed together. Consisting of not much more than a box cutter with a very thin metal ‘blade’, the Sump-Mod tool is intended primarily for making room for Red Sea’s ReefMat automatic filter roll. Despite not being sharp at all…
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[Lost in the Sauce]

Looks like they have figured out the "trick"

There is a tool in the automotive/machining world called a feeler gauge. It looks like this.

I've used these for cutting tanks apart / baffles out numerous times.

They can be had for a couple bucks at most auto part stores.