What am I doing wrong

[Uncle99]

Okay so I must be doing something wrong and I’m trying to figure out what it is. This is how I run my tank weekly
-20% water change to my 65 total gallons
-I started a year ago with dry rock
-I made sure to measure the par on my kessil lights to give good par to my corals
- I do two small feedings a day for my fish
-I run a fuge and skimmer in my sump and keep phosphate at a healthy 0.10 level
- I have two mp 10 that give good water movement
- I have a ato and filter socks
-plenty of copper pods/and brittle starfish growing in my tank
-my heater keeps a good temp at 79f
-I test my levels weekly but don’t see much change especially not enough to dos

but the only corals I can keep are torch’s and my Acon and poly everything else dies in a matter of month when adding to my tank even starter corals like ducans.

what could I possibly be doing wrong to continue keep killing corals

What specific corals are die?
Describe the death, tissue recession, polyp bailout, RTN, STN
How bout a full tank shot of your system.
I’m seeing a lot of green in the one pic, definitely a sign of high phosphate regardless of what the test says.
High phosphate is definitely a coral killer.

 

[Perthegallon]

I'm wondering what your fish stock is and your nitrates level. You may actually be too clean considering you run a skimmer, a refugium and do 20% weekly water changes. Some corals like it a little dirty.

I’m thinking about cutting it back to 2 weeks and 3 if I see positive results