This is bad

Clams look bad. They had been doing well for oh about 7 years. Did water change yesterday 60 gal also changed carbon and phosguard...now my large clams are all retracting!!!!! My smaller tear drop 3" looks fine and my smallest clam 1.5" looks fine.
My sps are all fine.
Only other thing I did was add peppermint shrimp to clean aiptasia last Friday.
Water chemistry is fine.
Any ideas?
MK



Clams look bad. They had been doing well for oh about 7 years. Did water change yesterday 60 gal also changed carbon and phosguard...now my large clams are all retracting!!!!! My smaller tear drop 3" looks fine and my smallest clam 1.5" looks fine.
My sps are all fine.
Only other thing I did was add peppermint shrimp to clean aiptasia last Friday.
Water chemistry is fine.
Any ideas?
MK