That clam looks good post shipment. The efferent siphon is a little large, but should recover quickly.
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Not good. Something is bothering his mantle
Is there anything in your tank bothering him?
I'd give it a freshwater dip.
The Maxima look fine to me, other than maybe something seem to took a chunk out of the mantle on the L front part. The picture Saturday show retraction mid R side, which resolved by today without treatment. This does not look like PMD to me.
Please read my description of PMD. I will copy it here:
".....
I struggled with this disease for several years. These were my observation of Pinched Mantle Disease:
............."
- The previously healthy clam, newly infected will appears healthy but will have retraction of one area of the mantle. This was not true with clam that was send to me sick, but always true with clams that were healthy then infected in my tank.
- The irritated, diseased mantle always retracted at the same place and mantle retraction spread from there.
- This disease affected all five species of Tridacna in my tank.
- The disease was slow in onset and healthy clams can live for months with this disease. My large Gigas live for over 1 year with the disease until I cure him with FWD
- Clam mantle retraction spread slowly from one area to adjacent area, rarely skipped area of mantles.
- Disease spread from adjacent clams most easy but there are infections of clams at distance location. This is much more common when the numbers of clams that were infected in a tank increased.
- Clams look better in AM, but mantles become much more irritated, more contracted by the end of the photoperiod.
- As the days go on clams secrete strands of mucus that can be seen extended from the disease mantles
- As the disease progress, the mantle retractions worsens and more, the diseased clam dies of starvation.
Your clam retraction varies from place to place. It looks like something is bothering it but not PMD. I would not FWD him.