Reef Aquarium

This worm is about 1cm long and lives in the algae growing on my overflow in my reef aquarium.

I have had this beautiful rock of Zoanthids with at least 4 different kinds on it, but ever since I got it the polyps started dying off.  It made no sense to me - Zoanthids are not hard to keep, and my water parameters were very good.  It was not until 5 months later, yesterday night, that I saw out of the corner of my eye the cause...

You would not realise it, but a simple change of the Metal Halide bulbs in your reef aquarium can make a surprising difference to both the colour and the amount of light.  Here I have replaced my unknown brand 2 x 250W 14000K bulbs with 2 x 250W 13000K Giesemann bulbs.  First the old bulbs:

Now with the new bulbs:

One morning I woke up to this... Little Blue-Knuckled Hermit decided to kill my Turbo snail, and take its shell. Just ironic that he does not know what to do with the shell as the hermit is 1/10th the size of the shell :)