I recently purchased a cleaning crew which came with a tiger tail sea cucumber. It did not occur to me that my gravel base would not be suitable for him. I have 2 UGFilters (one with a power head and one with a stone) that I'm not proud of but will be staying until I get a larger tank. Should I put some sand in an area for him? No one has bothered him but he has already spat out some of his organs. Is he doomed? Should I remove him? Only been in the tank for 24 hours. Thanks