If you do want to try and keep some whip coral in your tank go to Packary Channel jetties and pick up the stuff that has washed up off the oil rigs. There always seems to be a bunch of it wedged between the rocks there. One word of caution though, they are not photosynthetic so you will need to provide them with phyto/zoo plankton for there source of energy. Also, once the tissue starts to fall off there is basically no stopping it. My fiance is doing her masters thesis on fish associations with whip coral and has tried to keep it alive for a while now and the longest we have been able is about 2-3 months and then it just craps out. So good luck if you do find some and want to try it out.