you're going to confuse people with that as it is also a common name for Q-Tip sponges, and one that is more widely used.
Well, until now, when I had a little Web search, I didn't know that people call syconoid sponges Q-Tip sponges nor even pineapple sponges.
:headshake2:
What kind of whitish pineapples do they eat, actually?

They may be referring to the shape, only. But I said greenish-yellowish colour.
I saw once a sponge looking like Clathrina canariensis called "pineapple sponge".
And mine are rather box-like shaped, the bigger one the size of a thumbnail and yellow-greenish in colour. The bigger one has a little tube coming out of it and the smaller one is only a tiny unstructured mass.
As I got also Caulastrea frags that some people call "torch coral" but they're different from that what most people call "torch coral",
:grinyes:
I'll avoid in future the term "pineapple sponge". Too much popular ...
:silly:
Thanks, Nikko, for knowing now to have
Clathrina canariensis in my tank.
:idea: