crocea turning brown

[djrecklessk]

It weird, however I've been able to keep my crocea under 4 x 96 pc lights in my 150 gal tank for over 14 months now without ever having to feed him. I know this sounds bad, but at the time I purchased him, i didn't do any research, which was a big no no my part. As some stated I just got lucky, or did I?
Here is a pic of him.

In my experience I've notices my claim to change color slightly and his mantles would shrubble up for a few days, but then he'd be fine again. I'm definately no expert, but I would double check your water and make sure you are getting enough flow.

 

[critterkeeper]

"brown is a color that inverts use to absorb more light" - False.

"something else has happened to cause the reduction of symbiotic algae" - False.

"There are 2 main causes for brown coloration. The first is lack of light (par) and the second is too high of temp, which also leads to a lack of oxygen" - False.

The brown color is from the loss of pigments, not zooxanthellae. It's the zoox that are brown! and when the pigs go, the color of the zoox shows through.

As far as oxygen goes, when the lights are on the zoox can make so much excess oxygen that a tridacnid's gills actually run in reverse and give off oxygen rather than take it in. If they didn't it would poison the clam and kill it.

 

[gophia]

The brown color is from the loss of pigments, not zooxanthellae. It's the zoox that are brown! and when the pigs go, the color of the zoox shows through. [/B]

Is that in all cases? I believe that another possibility is that the over growth of zoox, in this case from an unknown reason, is making the pigment of the clam rather the loss of pigment.

ozadars,
have you checked your water quality?
It possible that there is too much dissolved organic whch is over feeding the zoox in the calm.

Just a thought.

 

[rchan11]

What's the cause of loss pigmentation?

 

[rchan11]

Can pigments come back?