Crocea Clam Browning/Bleaching???

[Reefie]

I have a Crocea clam that has some brown patches, could this be bleaching or not enough light? The clam originally had the brown patches when I bought it about a month ago.

I'm running Vertex Illumilux LEDs, which should provide more than enough light. I've also just added a couple of Ecoxotic White & Blue stunners to add a bit more light. I tried moving the clam up higher near the LEDs with no change, so I've ended up moving it back a little lower (10" from LEDs).

Will it get the colour back or will it stay brown? It has great blue colouration on the mantle, so I'd rather have it colour back up. Any suggestions?

If the colour does come back, how long will it take? It is happy where it is located now, it fully opens. I also give a squirt of Brightwell's Phytogold-M once a day, plus I dose Brightwell's Liquid Reef for the trace elements.

I have 5 clams in total, 2 Crocea's (the other one is purple with blue dots on the mantle), 2 Derasa's, and my latest addition of an Ultra Blue Maxima.

Here is an older pic of the clam in question. I apologize for the quality of the pic (Iphone 4).