HERE’S A RULE I FOLLOW ON DIVES: ALWAYS LOOK INSIDE THINGS.
You can’t tell what’s you’ll find: Octopuses in holes or old tires, eels in crevices, brittlestars in vase sponges, cleaning gobies in barrel sponges, banded coral shrimps under ledges.
Here’s a sharpnose puffer inside a tube sponge in Bonaire. Just hanging out, apparently.
There appears to be another little fish, which I didn’t notice at the time, inside the tube at the right.