Hello I recently introduce a Harlequin Shrimp into my tank and did the whole Coco starfish leg cutting feeding bit for him. I was doing a water change out today an noticed there were some very interesting looking square white colored blocks around where he hangs out and feeds. I couldn't find anything on the internet about what they were. If anyone has any experience with these guys please do tell. I just want to know to remove them if they are waste for nitrates or if they are food leftovers/storage from the starfish leg Thanks!