Horseshoe Crab Molt

[Jimbo Bucket]

I came across this the other day:

I pulled it out, its not a dead crab, appears to be a molt (silver dollar size). Couldn't find any posts on it so I thought I would post my experience.
90gal reef, about an inch of sand.
Horseshoe crab added to the system on 9/30/16.
He was very visible for the first couple months, then disappeared for weeks without any sand disturbance. Last time I saw a moving sand ripple was 3/10/17. Found this molt 5/21/17 near an area of sand disturbance. I've never feed him directly. He must be doing well enough to keep growing. The tank/sand has been running for a year and a half before he was introduced. I don't have any sand sifting critters in the tank.

 

[Clayalaleona]

I came across this the other day:

I pulled it out, its not a dead crab, appears to be a molt (silver dollar size). Couldn't find any posts on it so I thought I would post my experience.
90gal reef, about an inch of sand.
Horseshoe crab added to the system on 9/30/16.
He was very visible for the first couple months, then disappeared for weeks without any sand disturbance. Last time I saw a moving sand ripple was 3/10/17. Found this molt 5/21/17 near an area of sand disturbance. I've never feed him directly. He must be doing well enough to keep growing. The tank/sand has been running for a year and a half before he was introduced. I don't have any sand sifting critters in the tank.

He's still in there somewhere.
I wish people would stop buying horseshoe crabs, they're horrible additions to a tank lol

 

[Jimbo Bucket]

Found another molt on 10/10. Here are both size by side. Its grown a lot in 4 months.
The molts dry out in a couple days.