Zoas Turning Greyish Brown

[Prachmuth]

I have a large green zoa colony which has slowly turned a greyish brown. It is still healthy and growing strong.
The rest of the tank seems healthy, but I have reoccurring green algae on the glass.
Tank: 92g corner.
Lighting: 2x 250w (14k mh bulbs)
Placement: about 12-14 below waterline.
Calcium: 420'ish
dKH: 10-11
Amonia 0'ish
Nitrate .1'ish
Salt 1.026'ish


Thanks.

 

[Deanos]

You're welcome

 

[ESSELO]

greyish brown cotton ball on my zoos

i have a small greyish-brown cotton ball looking thing on my pink smootchies. they look good though. what is this?

 

[sjsoto]

Pics?....

 

[emmanuel]

if parameters are good in my experience too much light has caused this

 

[ESSELO]

is it fatal

 

[MatthewScars]

I had a huge colony die like this. They turn brown with algae thn start to grow coraline on them.

Try dipping them in Furuan-II. if that doesnt work, fresh water them for 10 minutes.

 

[Prachmuth]

I will try that.

I will try placing the zoas lower in the tank. Here they are now. I will post picture of any changes in a few weeks.

PAR

 

[lindsay]

Could be a few things ,i find that green zoas often do better color wise under brighter light but if phosphates or nutrients are high then this also will turn them a browner color.

 

[BaNDiTo_RoX]

I see you listed your parameters but not your NO3ish magnesium ish also ish ain't going to cut it you must know the exact reading also what's your PO4 level. But by the looks on the left side of the glass seems you have algee problems. As far as the zoas place them on the sand bed until they get there color back. What test kits are you using and please don't say API. HTH

 

[nanoreefer22]

What color were they before?

That color they're changing to could just be their real color. They look happy and healthy to me from that picture.