Actually,was out yesterday,with the water temperature around 10 degrees celsius(it's winter down here in the Sth.Pacific),,but with my 7mm wetsuit I was TOO WARM! Found a few more colour variations,and added a few more to the tank,together with some bright red sponges,and put a couple of starfish back,(munching on the sponges)....great to be able to stock my tank with local stuff after years of buying tropicals ....at huge expense....should have done this years ago,but never realised just how beautiful a coldwater marine tank could be!!