Bald spot on Acro

[USMA36]

I have had this Acropora in my tank since February. It has encrusted and grown well. Color seems fine and polyps are out. I believe it’s a Dan Aykroyd Acro. I’m pretty terrible at remembering names though. Anyway. As you can see from the picture it has a bald spot right in the middle. It’s been there for a couple of months now. It seems like it may be growing but at a very slow barely perceptible rate. Any ideas what would cause this. Alk 8.2 po3 .07.14 No4 15-20 temp 79 salinity 1.025 - 1.026. The bald spot looks like it has a slime coat around it kinda like what a green slimer does when annoyed or handled.

 

[Troylee]

Looks like a bill murray.. with that being said it looks like stn from the base up which is caused by alk swings and I’ve heard ph burn.. have either of those jumped or dropped?

 

[USMA36]

No. Alk is always within .5

 

[Troylee]

Any direct flow blasting that area? Some times we’ll never know if it’s not the obvious

 

[USMA36]

No direct flow. What would be the best way to stop that from spreading?

 

[ryanjohn1]

Possibly stn

 

[Troylee]

No direct flow. What would be the best way to stop that from spreading?

I just leave it and hope the flesh grows back over it! Some times it does some times it don’t… if you can get it out people use super glue

 

[DanyL]

That is likely an STN or a burn, from the way it looks it might’ve been caused by stringing from another coral, I had acros fall down on chalices or mushrooms before and it looked very similar, although the burn signs appeared only after a day or two.

I would wait and see if it spreads out or not, if it spreads - cut whatever living tissue you can save and toss the rest.

If it stops, I recommend cutting a frag or 2 from the living tissue and gluing it over the skeleton, this would drastically speed up the healing process, although you could also wait for it to slowly grow back naturally.

 

[dadnjesse]

Is your tank 70 degrees or did I read that wrong. If so thats in my opinion too cold.

 

[DanyL]

Is your tank 70 degrees or did I read that wrong. If so thats in my opinion too cold.

That will definitely do it.

 

[USMA36]

Is your tank 70 degrees or did I read that wrong. If so thats in my opinion too cold.

79 degrees. Typo.

 

[dadnjesse]

79 degrees. Typo.

Thats what I figured