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I agree, go all the way around and try to create a path for the break. Go as deep as you possibly can all around. Then try the drill bit trick. The drill bit will bore into calcium pretty well, much better than a chisel due to the spike leading point.
It's a shame to hear that colony is getting chopped, it belongs in a 1000 gallon show tank or something, maybe I should have bought it and granted a pardon to Tracy Grey's system hehe
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