Horseshoe crab

[Dr_Hicks]

I had kept one in a 125 for about 6 years until the little critter finally have up the ghost, was interesting to watch; pretty sure it was around $10 or so at the LFS.

[Mike-fish]

Big Al's had them in a while ago. They also had some very large ones in the shark tank for a while they did quite the number on the acrylic

[chandigz]

My old roommate had a dried skeleton that was at least 18" long. main body was about 8" around.

[Snappy]

Originally Posted by chandigz

My old roommate had a dried skeleton that was at least 18" long. main body was about 8" around.

Yes they can get really big. They are very cool looking but I would not put one in my reef unless I had 2-3K gallons with lots of open space.