Were giant Paleozoic cephalopods filter feeders?

[Halichoeres]

What if gigantic animals like Cameroceras weren't just nautiluses on steroids, but huge filter feeders? Hard to be sure since the relevant tissues would not fossilize readily, but it's an intriguing hypothesis that should definitely be considered for any marine animal over 6 meters in length.

What it would look like, reconstructed by Andrey Atuchin:


Paper (paywall): https://www.tandfonline.com/doi/abs/10.1080/08912963.2018.1491565?journalCode=ghbi20

[Ravonium]

Interesting idea. I actually kind of prefer Cameroceras being a filter feeder now 

[Faelrin]

Reminds me of the Vampire Squid and a plunger. Still would be pretty scary meeting up with one of those, even if a filter feeder, just because of its size. Like the Colossal Squid and such.

[Neosodon]

Certainly looks unique. Would make an interesting figure or lamp design.