White slime is consuming my polips

[Claudio D]

I have some green polips from the caribbean in my reef, lately some white slime is consuming them. I tried to blow the white stuff with water preassure and applied some Lugos solution but today it reapeared
When I used the water some grey dust, came from beneath them
Note the polips came attached to the rock when I purchase it.
PH 8,1 to 8,4 fluctuated between night and light on
1,024 o amonia, nitrate and nitrites
4 month old aquarium
Ca 400 6 to 7 Dkh

Thanks for any help

Claudio

I have a picture, I do not know how to post it...

 

[kevin2000]

This is the fish disease forum ... I suspect a coral problem would be better addressed in one of the coral forums or perhaps the general "reef" discussion forum.

Good luck