What is the issue here?

[FirstCameFish]

It seems that a lot of our corals are bleaching. They are all losing some color. I'm curious what the issue could be. I can't figure out if it could be because of the flatworm battle we are fighting currently or is the speckled leather just wreaking havoc on everything.
I can get water info later if needed, I'm the overly worried tank mom while my husband is the one who actually handles everything.
Any thoughts or advice, specific or in general to our tank, greatly appreciated.

 

[Gumbies R Us]

What are the parameters of your tank?
What about lighting? (par level, lights you are using)