Maybe its the pictures but I don't see any problem algae. And treating them for pests wont do any good if you just put them back into your tank again afterwards. The simple solution would be to move them to a tank where similar types of coral are flourishing.
Have you begun to do anything to lower the phosphate in your tank?
Is that a mushroom coral growing on the favia? Mushroom vs favia = mushroom lives and favia dies.
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