Your situation sounds completely normal, and is the main reason why people with SPS/mixed reefs don't keep BTAs.
Sounds like you've got a major re-aquascape in your future. The only way to remove a BTA that's "dug" into a rock is to remove the entire rock and use a hammer and chisel to break the rock apart and pull out the nem.
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Tank info: 120 gallon 48x30x20 high DT. Clownfish breeding rack in full swing: C-Quest Onyx, Bali Aquarich P1 Picasso + Rod's Onyx, wild percula + Rod's Onyx.
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