Certain coral tissue slowly receding

[Eternal_]

The tank is 29 gallons and has been up and running for about 10 months. Since I have started the tank I have noticed that certain corals in my tank seem to do better than others.

So far over the past 7 months I have lost 2 Favia, 2 chalices, 1 micromussa, 1 nepthea, 4 zoanthids, 2 ricordea, and 2 discosoma. I am about to lose 2 chalices and 2 candy canes.
The corals that seem to do well in the tank are blastomussa, gorgonians (both Photosynthetic and NPS), leathers, Goniopora, Blue ridge, and leptoseris.

Recently I set up a new fluval evo 13.5 and moved some of the zoanthids that were not doing great in my tank. I have had the zoas in my tank for the past 6 months and they have not grown and have been slowly losing polyps. This is making me think that maybe it was something in the water that is messing with the coral? Any help would be greatly appreciated.

Tank parameters:
Temperature: 78.2F
Salinity 1.025
pH: 7.6
Alk: 9
Calcium: 450ppm
Nitrate: 2ppm
Phosphate 0.4ppm

Lighting Schedule (AI Hydra 26)

 

[vetteguy53081]

The tank is 29 gallons and has been up and running for about 10 months. Since I have started the tank I have noticed that certain corals in my tank seem to do better than others.

So far over the past 7 months I have lost 2 Favia, 2 chalices, 1 micromussa, 1 nepthea, 4 zoanthids, 2 ricordea, and 2 discosoma. I am about to lose 2 chalices and 2 candy canes.
The corals that seem to do well in the tank are blastomussa, gorgonians (both Photosynthetic and NPS), leathers, Goniopora, Blue ridge, and leptoseris.

Recently I set up a new fluval evo 13.5 and moved some of the zoanthids that were not doing great in my tank. I have had the zoas in my tank for the past 6 months and they have not grown and have been slowly losing polyps. This is making me think that maybe it was something in the water that is messing with the coral? Any help would be greatly appreciated.

Tank parameters:
Temperature: 78.2F
Salinity 1.025
pH: 7.6
Alk: 9
Calcium: 450ppm
Nitrate: 2ppm
Phosphate 0.4ppm

Lighting Schedule (AI Hydra 26)

Probably something in the water is correct and the nepthia does release low level toxins known as terpenes also associated with other leathers.
For zoas, they dont need a lot of light and moderate flow is sufficient. Assure salinity and Phos has not become elevated.

 

[Eternal_]

Probably something in the water is correct and the nepthia does release low level toxins known as terpenes also associated with other leathers.
For zoas, they dont need a lot of light and moderate flow is sufficient. Assure salinity and Phos has not become elevated.

I do run carbon in the tank to try and help with leather toxins and my phosphates are pretty high because of the amount of food I am feeding in the tank for the NPS coral. The tank is full of macro algae but I am still struggling with high phosphates. Is there anything that I can do to lower the phosphates but not bottom them out?

 

[vetteguy53081]

I do run carbon in the tank to try and help with leather toxins and my phosphates are pretty high because of the amount of food I am feeding in the tank for the NPS coral. The tank is full of macro algae but I am still struggling with high phosphates. Is there anything that I can do to lower the phosphates but not bottom them out?

Reduce feedings
Add a pouch of chemiPure Elite which contains GFO to help reduce phos and has high grade carbon
Utilize a protein skimmer
Do daily water changes of at least 2 gallons for 14 days and recheck

 

[Eternal_]

Reduce feedings
Add a pouch of chemiPure Elite which contains GFO to help reduce phos and has high grade carbon
Utilize a protein skimmer
Do daily water changes of at least 2 gallons for 14 days and recheck

Ok sweet, I'll give some of those methods a try. Thank you!