LPS melting away

[ltjn11]

Help my lps corals are melting away very quickly Saturday night my torch coral melted away almost over night. Yesterday all looked good got home from work tonight my frogspawn has done the same thing. Water parameters are as follows Ammonia less then 0.1,nitrites show 0,nitrates 20, kh150,phosphates 0 or very close to it,calcium 440. I still have a bubble coral and an elegance that I don't want to lose. Any help greatly appreciated Larry

[Slyguy00]

This might be a silly question, but what is your temp and salinity at?

[ltjn11]

temperature 78.6 salinity 1.025

[hfp75]

One mistake I made is not feeding my LPS. Some can survive without target feeding but if you do they will be healthier. When they are only surviving on UV they aren't as healthy. If the LPS looked ok but really was borderline and exposed to RTN it might just be to much....

RTN in a tank isn't good and is known to spread quickly - hence the name...

If a coral is dying toss it - don't try to save it. Unless you can frag it to try to save it. Toss the RTN part!!!!

[Sebae again]

What is your Mg at ?

[ltjn11]

I target feed twice a week a small amount is there any way I can get a handle on this before losing all hate to say it but never really tested for mg should get a test kit I suppose

[Sebae again]

Yeah. I have had hammer and frogspawns loose heads due to low Mg. Also I believe that there is a strain of bacteria that can cause LPS issues.

[Wheelman76]

150 is ppm , just multiply by 0.056 to get DKH. 150ppm = 8.4dkh

[saltyair]

Flow? Lighting?.

if no containment and stable parameters lighting and flow would be my guess.
How old is the set up?

[ltjn11]

As far as flow have MP10 and two hydor power heads have coral and power heads situated so they sway steadily but not being torn apart. My lighting is leds they are full spectrum par 38 bulbs 4of them. The corals are about mid tank height tank is standard 90 gallon.