So with the moonlight phase in place, I decided to have a squiz at my tank before going to bed, and when I peered into the tank, right at the top of the highest rock formation I have, I see this Alien-like creature, perched upon my rock.
As if it was winking at me, the white of the cowrie shell disappeared as the fleshy part if the cowrie somehow managed to fully engulf the entire shell, while also protruding small stems or tentacles, like spikes from its flesh.
I tried really hard to get a decent pic, which was proving impossible with my trusty iPhone 4. So I grabbed the fiancé's iPhone 5, and managed to snap this below (which is still horrible, but much better than nothing, and much better than anything I could take).
I'd never seen anything like it before. And when I thought I might try and take a shot with a flash, the spikey flesh opened up just slightly, to show the white of the shell once more, like an awakening eye but without the pupil or iris.
I'm now on a google hunt to find out why my cowrie was doing its little Halloween skit, and if it will do it again.
I'll also be researching a DSLR.
Edit: Here's a much better picture of what I saw, that I just found. And what I didn't know was that this is how they look when they are eating, as they are nocturnal.
Mum was right. You do learn something every day.