Something is stressing my clams

[Nicholas Ang]

I have a total of 10clams of all sizes in my 100G sps dominated tank.

Recently found that two of my clams are showing signs of stress. It has been worrying me. The problem seems to start when I tune up my calcium reactor when I find my tank alkalinity drop to 8dKH. The current dKH is 10 after the tune up The process has taken place in the space of three days.

Here is the look of my derasa previously

Looking in pink health isn't it?

I own her for close to a year. I love my clams as much as I love my sps She has been a fast grower IMO. Growing abt 6" from the day I bought her over.

She has been showing signs of growth recently. Probably that might explain why I tune up my CR, along with the increase in my growth of my sps. But the sight of it now pains my heart.

She has been looking like this most of the time. Occasionally she will open up nicely as what it used to be. When she does, she doesn't gap excessively. But I have been looking at her, with her mantle retracted most of the time

I am worried. I don't wish to lose this beautiful creature. Most of my other clams are fine, except for my crocea which is showing the same symptoms.

I had check the underside of the clams. Can't find any signs of possible parasites attack.

Can someone suggest something?

 

[hwynboy]

fish

What fish do you have?

 

[nolofinwe]

has the circulation in the tank changed at all? Moved rocks, new pumps, etc?

 

[Peabody]

Low alk can do that to some degree. But I agree with above....do you have any fish that could have turned into a nipper? Any angles, blennies, etc?

 

[Nicholas Ang]

I have a couple of anthias, & two tangs.

As far as I notice, they has not turn into clams nippling creature

My other clams are fine.

 

[Johnsteph10]

Croceas are known to gape for whatever reason and then are fine again. Have you been messing with SG at all in your tank? By tuning up your CR, do you meaning increasing it? Have you checked your other parameters? Nothing else has changed?

I'm not sure - you're right, no gaping but mantle retraction. Light response? I would just give it some time!