Help with Frogspawn and trumpet coral

[fjuriolli]

My tank is fairly new (7 months).

My water parameters taken today:
KH: 9.5 (between 9.0 and 9.5)
Ca: 450
Mg: 1520
Salinity: 1025
Temp: 26.9°C constant (chiller)
Ammonia: 0
Nitrite: 0
Nitrate: 20
Phosphate: Unknown (I dont have the test yet)

I do balling manually and parameters are always like this

This is my frogspawn 3 weeks ago:

Since last week I noticed that he shrunk in size, like this:

And this is a picture from today (one of his head is detaching from the coral)

Also, from the first image you can see my trumpet is doing great, but now he's also struggling, picture from today:

I have other corals such as duncan, zoanthus, palys and a hammer coral which are doing great.

Any reason why this is happening?

 

[Retro Reefer]

Knowing you phosphate is critical, looks like the last picture aiptasia is probably killing your trumpet.

 

[fjuriolli]

Knowing you phosphate is critical, looks like the last picture aiptasia is probably killing your trumpet.

I dont think my phosphate is high, I'm dosing redsea NOPOX everyday because my nitrate was high (40 ppm)

EDIT: one of the heads is like this now:

 

[kichimark]

Best to take care of that aptasia now on the trumpet. They can cause a lot of stress to nearby corals. Regarding the frogspawn, how much flow do you have on him and light? Your parameters are fine so I would look into that next. Place the frogspawn in a low flow/low to medium light area.