I have had a Crocea Clam in my tank for about 4 months now and it has been doing fine - has grown two new layers of scallops on its shell.
It is in a 12 Gallon Nano reef tank. The only thing that has changed since I got the clamis that I changed the lights last weekend. originally, I only used the lights that came with the tank: one 24 watt white cfl and one 24 watt actinic cfl. Last week I got a strngoer light that uses two 40 watt cfls, one white one actinic.
About three days ago, the clam turned itself 180 degrees. Since then, every few hours, the clam turn between 45 - 90 degrees. Today it started moving forward so that now I can see the bysal (spelling?) strands stretched out behind it.
since introduction of the new light, the clam is also exposing moe of its mantle. Except ofr this and the movement, it is acting fairly normal - reacting to shadows, cclosing completely when startled, etc.
The clam is on a rock about 6 inchs below the surface on the edge - so if it drops, it goes straight to the bottom of hte tank.
Is all this movement normal? Is it possible that there is too much light? Will it jump off the cliff? Should I try to move it to a new spot, or leave it alone?
Any advice would be aprpreciated.