Humilis Acropora turning white

[kkoch]

I have about a 1" frag of Humilis Acropora turning white from the base up. What could this be from? I only check params below. I do not dose. I feed zoo plankton once a week. I use Reef Crystals. Water change 20% weekly. All other coral, etc. doing great. Looked like picture attached.

5g nano
1.025 sg
NH3, 0
NO2, 0
NO3, 20
PH, 7.8
temp, 79

 

[ostrow]

You need to attach a close-up of the humilis, with focus on the base of the coral, for us to have any informative response here. Could be any number of things.

When you post the photo, please include how long you have had the coral, how rapidly the deterioration seems to be progressing.

 

[skunkmere]

whats your lighting and is your temp stable.

 

[kkoch]

Lighting is LED's, 6k and blue, 12 hour cycle. It is in the bottom third of the tank. The polyps were open about 2 weeks ago. Temp is hard to control in the 5g. Swings from 79 to 82. I have a 240 Koralia providing a lot of flow for 9 hours. It is 2/3 white now. I have been reading that it probably has RTN. Also maybe toxins from zoas and leathers? To soon to have an acro in a 2 and 1/2 month old tank. The list goes on. To many possible problems. Picture is from 2 weeks ago.

 

[menard]

Humillis r one of the acros. which would i say challenging to keep. in the wild they very much u will find them on the upper reef slopes so they need tons of flow, sunlight , low po3 very steady environment. If u want something in that color I would suggest green slimer .

 

[ostrow]

It's in a 5Gal?

Menard is right.