you have to consider the direction you want your tank to go. if it's a tank that is going to have invertebrates in it (fish *should* be fine with it), then i would highly recommend throwing that rock out. Lots of heaters that break end up spewing a bunch of chemicals into the water (not uranium and that kind of really toxic crap... i mean the other everyday elements... copper is the main thing Id worry about). the porous rock will soak copper up like a sponge and release it over a VERY long period of time (longer than the tank will stand Id wager). even if you test the water for copper, you might not get a result because it's in the ROCK.
personally i would chuck it all as well as the container it was it.
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