All corals dead/not open please help

[Rodan]

I've had my fish tank for 2 and a half years. Everything was fine until it wasn't. I had torches, mushrooms, hammers, and many more. The only thing that's left are zoas that wont open and they are slowly fading. I'm wondering if anyone has any advice because to have everything go is really confusing. Normally even my zoanthids would be fine in horrible water quality. I'm just wondering if there is a nutrient that I'm not testing that my aquarium doesn't have.
Temp 77.5
Magnesium 1500
Calcium 420
alk 7
ph 7.9
Nitrate 10
Phosphate .2

I'm just so confused on how to handle this because its been a slow burn. I've so many water changes. Please any advice on what to do will be greatly appreciated.

 

[~MD~Reefs~]

I've had my fish tank for 2 and a half years. Everything was fine until it wasn't. I had torches, mushrooms, hammers, and many more. The only thing that's left are zoas that wont open and they are slowly fading. I'm wondering if anyone has any advice because to have everything go is really confusing. Normally even my zoanthids would be fine in horrible water quality. I'm just wondering if there is a nutrient that I'm not testing that my aquarium doesn't have.
Temp 77.5
Magnesium 1500
Calcium 420
alk 7
ph 7.9
Nitrate 10
Phosphate .2

I'm just so confused on how to handle this because its been a slow burn. I've so many water changes. Please any advice on what to do will be greatly appreciated.

What’s your salinity at?

Have you checked for any pests?

Are you saying everything died all at once or slowly died off?

 

[ReefQuestCorals]

I've had my fish tank for 2 and a half years. Everything was fine until it wasn't. I had torches, mushrooms, hammers, and many more. The only thing that's left are zoas that wont open and they are slowly fading. I'm wondering if anyone has any advice because to have everything go is really confusing. Normally even my zoanthids would be fine in horrible water quality. I'm just wondering if there is a nutrient that I'm not testing that my aquarium doesn't have.
Temp 77.5
Magnesium 1500
Calcium 420
alk 7
ph 7.9
Nitrate 10
Phosphate .2

I'm just so confused on how to handle this because its been a slow burn. I've so many water changes. Please any advice on what to do will be greatly appreciated.

What brand test kits are you using? Curious if you have been dosing, for someone doing many water changes with mag at 1500 tells me you either dosed mag to that level or your salinity or tests are wrong.

My advice would be to hold on the water changes seeing the corals are already stressed if you do have any left, and figure out the root cause. Also replacing so much water but nitrate is 10? Something doesn't add up right.

 

[Mr. Mojo Rising]

We need pictures!!!! Pictures tell a thousand words. The only info you're giving us is that it was fine then it wasn't, we can't do much with that!

Why is the alk so low? What type of lighting and flow? What is your filtration? What is your maintenance practice like? Why did you say horrible water quality, whats going on?

 

[Savage Henry]

I had a crash recently and I am still trying to find the reason/s.

I had a broken power cord on my wave maker. Not saying that caused my crash, but it was present at the time. So there was bare copper in the water. I have been told/read contradicting opinions on whether this would have caused any problems.

Maybe check your equipment.

 

[VintageReefer]

Your measured parameters won’t kill coral. Look elsewhere

 

[aquatic.life1]

I've had my fish tank for 2 and a half years. Everything was fine until it wasn't. I had torches, mushrooms, hammers, and many more. The only thing that's left are zoas that wont open and they are slowly fading. I'm wondering if anyone has any advice because to have everything go is really confusing. Normally even my zoanthids would be fine in horrible water quality. I'm just wondering if there is a nutrient that I'm not testing that my aquarium doesn't have.
Temp 77.5
Magnesium 1500
Calcium 420
alk 7
ph 7.9
Nitrate 10
Phosphate .2

I'm just so confused on how to handle this because it’s been a slow burn. I've so many water changes. Please any advice on what to do will be greatly appreciated.

What brand test kit are you using, is it expired? Have you checked for ammonia, nitrite? From experience we had coral slowly dying and did a water test and had a massive ammonia spike. Everything was fine in the tank until we noticed the coral dying and tested everything and that was the only thing that was extremely high.

 

[Gumbies R Us]

We need pictures! Pictures can help tell us a lot of what’s going on with your tank. Do both close up pictures of your coral and fts photos.

Im also curious to know what the flow in your tank looks like and your light settings.

What about algae issues?