Any ideas for a strong CUC for a 40 gallon aquarium? I know that I need to make my own decisions but any suggestions? Emerald crabs, cerith snails, serpent starfish and anything like that is unavailable in Australia so Indo Pacific only :/ Wish I lived in the USA. I already have a nassarius snail and a pincushion urchin and I am soon to get a multifora Lincktia or red Lincktia or a spotted licktia. Thanks for the help