Hi Forum,
when clams are bleached then they have lost their zooxanthelles in the bleached area. Moving the clam into brighter light won´t help in this case.
Better is this way:
Cut a piece of a Clam-Mantle or a Soft-Coral (both include Zooxanthelles) , put them into a Mixer and mix them well.
Poor the fluid through a 25µm sieve.
Move the clam in a very small tank (or something else that fits best to its size).
Feed the clam with the filtrate (the content of the sieve) and wait about 6 hours.
Put the Clam back into your normal tank.
I recommend feeding vitamines and Aminos too.
The Clam will filter the Zooxanthelles out of the water.but does not digest them. They will be transported into the Mantle and will be warehoused there.
This is the same way that is used for baby-clams in Clam-farms.
Best regards
Kristof