Brown spot on clam?

[mr pink floyd]

So lately ive had a weird brownish dark spot on my derasa, since it went in the tank a month ago its been healthy, always open, no gapping, reacts to shadow very quickly, and recently ive noticed just a brown mark near the output siphon

the picture isnt the best, and the clam is semi closed because i had to move it to get a picture clear enough to see a tiny bit

it doesnt seem to be deteriorating, its just a brown spot(looks blue in the picurem but its a light brownish color)



any help would be great,

Thanks

[Lagger]

I've noticed the same brown spots on my crocea. Most noticable when the lights are off with natural sunlight in the room.

Not sure if it's a bad sign or not, because, like you, the clam sure looks healthy.

My crocea is sitting right next to a mushroom & I think the mushroom might be pi$$ing it off. Thats my reasoning anyways. How about your clam, is it fighting for real estate?

[mr pink floyd]

Clam is sitting on the sand all alone, i have seen a bunch of i think rissoid(sp?) snails around

i got an ID before i bought it they are not pyramid, and dont feed on clams, btu maybe the ****ed it off? i caught a few on the shell but non on the mantle, they tend to stay on rocks more

[a4twenty]

how old are your lights?

[mr pink floyd]

light is pretty old, new bulb comes thursday, its gonna be a phoenix 14k

[a4twenty]

with 20k bulbs ( your previous ) the PAR really starts to drop off after 6 months or so. clams can start to lose color under insufficient lighting conditions, hopefully your new bulb will solve the problem.