Coral ID and Advice

Hello,
I have been having some problems with some of my corals in my tank. The ones that are not doing well are the dragon eye zoas, some sort of montiporas and my little baby plate coral. Xenia is not working out in my tank.
Here are some photos of the troubled corals, and one i need an ID for.
Green Digitata, seen in the top right of the picture is bleaching. I also need an ID for the coral in the very center, somewhat blue and green.

My plate coral, it seems to be stressed with some bleaching

***Montipora encrusting coral, not sure of its full ID but it once was purple with bright green spots, now almost completely white.

Another Montipora encrusting that is doing very well

***My green dragon eye zoas, added about the same time as my other zoas but there is a difference
Before (notice the polyp loss compare to it now)


After

Other zoas which are open

I need an ID for this coral on the frag plug.


Yes, i do have alot of green slime algae, and i am getting very small spots of red cyno bacteria, starting up my phosphate reactor with some GFO. The green slime algae is disapearing more and more everyday. Im going to go ahead and try to propagate the coraline algae i have.
I also used to have xenia stalks, it never grew. Would open on its first day then close up and never open again untill death. Any idea what to do?
My ph is 8.02
no nitrates, or ammonias
10% water changes on a weekly basis, i use tap water though.
The tank is over 2 months old with no fish loss, and 1 dead xenia and 4 snail losses.
A friend suggested to dose with Lugols solution, i had potassium iodide in my closet so im going to add some of that... lugols solution is composed of iodine and potassium iodide.
Will dosing with supplements help? I have all the ingredients for a 2 part solution of, calcium and magnesium sulphate and baking soda. With light dosage.
Thanks, i hope someone can help me out

 

I'm not a coral genius but I've done pretty well with them. 0 nitrates and 0 phosphates are good. The tap water for changes can be a major problem. I would use R/O water for a base if you mix your own.

I have water changes once a month with 75 to 100 gals of fresh sea water delivered because I live by the ocean. Water changes stress out the fish so I prefer one large change monthly. For $1 a gal it's worth it to me so I know that it will replenish my tank with trace ellements and nutrients that get taken out by filtration. Try a product called Liquid Reef by Brightwell. I put some in every other night. Or try a 2 part dosing. Maybe this will help.

 

ouch sorry about your luck....

 

the plug looks like a small mushroom to me

 

looks like ricordia on your plug there almost certain