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[Vili_Shark]

Hi,
My friend have an established reef for 4 years.
He had around 15 Clams inside and SPS.
All Clams+SPS were doing great, and had significant growth.
About a month ago my friend, bought some T.maxima and T.crocea.
All really high quality.
At first they were doing great , but after a week or two the Maxima started closing and evetually died.
Another bunch of clams ended up the same way.

Only the T.maxima is getting affected, besides this, all is great.

We're talking about 7 Clams, while another 3 starting to close now, and looks they are on the way as well.

What can be the reason for such Maxima mass death?