Well, like the title asks, if a Brig has lost it's trap door will it grow back? I noticed 2 doors on the sand and one snail dead. The other maroon has also lost its door, but is alive and moving around. The 2 purple in the tank are fine. I did notice a worm come from one of the purple brigs - I thought it was poo until it landed and then started to move - it was brownish -- not a white nematode or a planaria -- too cylindrical for planaria, it actually almost looked like it has little legs??? Any ideas or advice besides a sand vac and water change?