Time to "ATTACK"?
When I used to be in glass working, we used a product named "Attack" to remove cured two-part glues and resins. Most of the time it was to remove glued on brackets, mounts etc. The stuff works by breaking the cross-linking action of the catylist within the cured resin. It had to soak for quite a while, but it did make things come appart. We used to buy it in small (6oz.) cans from a jewellery supply store, but I am sure it would be available in larger sizes.
The other way we used was to "bake" things in the kiln for a while. That might not be a good plan for your tank, but maybe putting the steam cleaner wand in it, and leaving it there until the tank is as hot as possible, would help lossen the fiberglass.
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