Sps problem

[Parraman]

Hi guys.

I have a lot of trouble with my sps.
What might be the cause of this? Foto below.

http://i900.photobucket.com/albums/ac207/Parraman/20150501_123112.jpg (http://s900.photobucket.com/user/Parraman/media/20150501_123112.jpg.html)

You can see that the polyps are still there but the flesh is gone.

Newly added sps will be fine for about 2 to 4 weeks.
After that they won't have that great polyp extention.
After that they will turn out like the pic above or they don't make it.

Tank is 30cm deep and 1.8m long.
Have 2 tunze 6095 in the tank

Lights - Pacific sun Hyperion
A lot of cheato in sump

Ph 8.2
Kh 7.0
Ca 420
Mg 1300
Temp 24 degree Celsius

Can it be some sort of pest?

[Tweaked]

What's the po4 and no3 coming in at? Even with a pest, it wouldn't be that severe IMO. Decent flow in the tank?

[Parraman]

Was thinking some sort of mite?

po4 - 0

[khiann]

Was having similar issue in my previous tank... It is a pest. It eat almost all types of spas except monti and birdnest. The bugs looks like tiny round snail. Start mostly on the bottom part and ate its way through. Was not able to win it as multiple dip did not help and it kept coming back. The eggs looks like aefw egg but not in cluster..spread all over over sps body like tiny red dots. I torn my tank, dry all rocks and restarted at the end. Lost over 30 pcs of sps.

[Parraman]

Was thinking it might be something like that.
Someone told me a clingfish might help?

[Parraman]

Here is another pic
http://i900.photobucket.com/albums/ac207/Parraman/2015-05-02%2014.36.29.jpg (http://s900.photobucket.com/user/Parraman/media/2015-05-02%2014.36.29.jpg.html)

[Parraman]

Can this be light shock?

[markalot]

It could be just about anything.

Do you know if your parameters are stable day to day?

Do you have a doser?

How many fish in the tank?

Do you feed the corals?

What test kits do you use for each test?

For dying SPS the most common causes, at least in my experience, is either a KH spike in a newer tank or they are starving in a newer tank due to lack of food and low nitrates and phosphates. Generally unstable KH or other parameters will lead to death and pealing skin while low nutrients will lead to very pale corals.

[Parraman]

Hi guys

If I remember correctly a chalice also needs very good water quality with a little bit more nutrients than sps.
I do have a chalice and its growing very nicely on the side of the tank (Not directly under the lights).

So I still don't think its the water or am I wrong? My experience with chalice coral aren't that great.

@markalot I test my parameters each week.
I use a dosing pump for kh.
fish : yellow tang, sailfin tang, 2 clowns and a diamond back goby.

Tank is 2 years old
I have used fuel in the past. I will check what the other product is.

Mostly salifert test kits.

The problem is the skin is missing. Yesterday I looked at it under the microscope and its literally just the polyps left.

[Parraman]

Bump

[Parraman]

Any comments?

[Parraman]

Bump

[Pife]

What's your nitrate and p04s? How long have these corals been in your system?

[reefmutt]

Looks, to me, like a peppermint shrimp has been feasting on the flesh..
Got any peppermint shrimp? Or camel shrimp?