Keeping a marine aquarium can have its surprises.
Today these strange little creatures appeared all over the front glass of the tank.
At only a millimetre or two across they were very difficult to see in any detail but looked a bit like tiny shuttlecocks, especially when they moved.
I tried to film them using my ipad and a clip-on magnifier, but the results weren't brilliant.
I can only assume they were the larvae of some anemones I have in the tank.
Here is a speeded-up video of one of them.