i need some thoughts!

[kungfuujew]

so i have been fighting with most of my lps in my tank.
the flesh is recuding from the bottom up and when it gets to the top of the skeleton the coral kinda melts away i am not sure whats going on.
corals with a problem are frogspawn hammer acans dendros blastos

levels are as follows
kh 10.3 this might be the problem
ca 435
mg 1420
phospate 0.00 hanna checker

below are a list of fish and other corals in the tank.

lps is most of my tank. i have two rose anemones that are doing amazing. a mini maxi that isnt so mini. i have a maxima clam that is killing it(doing great), duncans are doing well, zoos are fine, hurricane chalice is doing great. lobo is fine, walking dendro is doing well also. most the lps have been in there atleast 6 months.
fish have been in the tank almost three years and dont bug anything they get feed everyday and are way too fat.
i just put a purple stylo in there about a week ago and it seems to be fine.

 

[criticalencore]

I'm going to guess a nipping fish.... the alkalinity isn't bad that high as long as it's stable. The lack of po4 could be a problem maybe. Any changes in flow? Maybe too much light? Think ha know to any changes you made before everything started going bad, even little changes like added carbon or anything....

 

[kungfuujew]

well i was traveling for a few months and was home enough to do water changes when it all went down hill. corals that i have added in the last week seem to be fine but most likely havent been in long enough to be effected by whatever it is. i did change to led lights and the flow was reduced.

 

[criticalencore]

Are the led dimmable? Maybe too much light. Led are more like magnifying glass light where bulbs seem to broadcast it more. A lot of people when they switch to led over light it and kill stuff.