I don't see it all that commonly in the hobby. Have you noticed it taking to spot feeding? The genus as a whole is similar to Linckia, so it may not, in which case a mature reef tank at least 100g with lots of LR will be better. If it does take to spot feeding, then the size is not as critical though water quality will still be critical (not always able to keep stable in more aggressive systems). What fish are you planning for the semi aggressive? Puffers, triggers and larger wrasses will definitely be a problem for these stars. Angels and butterflyfish may also pick at the arms.