Exactly that, they bite on the rays disc, bichirs can also death roll (like an alligator) which if a decent sized one latched on to a rays disc and did that the damage would be pretty bad. Of course there are exceptions to all of the "bad mixes" of stock, it might work just fine. PBBs are for sure a larger bichir specie, and one of the more rare kinds. Never saw one locally, only vendor I've ever seen have them is Jurassic Aquatics. Kind of pricey too!
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I really don't want that to happen! Yea the death roll would mess it up big time
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