Questions, thoughts on Porcelain Crabs

[smalltownfan]

While we're on the topic of BTA's. I've been reading about them and Porcelain Crabs. About a week ago I bought a BTA1 that was all bubbled up. The PC abandoned his Duncan and started hosting in it. As it scrambles around the tentacles they deflate and by the end of the day it's all spaghetti noodles. He is also aggressive when my Clowns try circling nearby.
I've been reading about these guys and their symbiotic relationship and from what I've read it's 50% PC's are good and 50% their bad.

Anyone here have any experiences with them?

Hank