What could be causing my acans to do this?

[CF12Valve]

I have 8 small Acan colonies that have been doing great for the past year or so. One of them started to close up and turn kind of blue. All of the others still look great with no changes to lighting or flow. I have dipped them in iodine about a week ago and they still look the same. Does anyone have any insight on what could be causing this one colony to be doing this?

 

[HudsonReefer2.0]

Hard to tell from pic. Is it a feeding response or tissue recession.? Also how old is the tank, type of lights, placement, par? Water paramteres? Try to get a piccw
White light or filter the blue.

 

[CF12Valve]

I’ll try to get a better picture, but they’re on the lower right side of my 75 gallon. I have t5 hybrid lighting with two Kessil A360we, two gyre pumps on either side of the tank and they’re getting around 130 par in that area. The tank has been set up for about 3 years with the following parameters:
Calcium: 460
Alkalinity: 8.2
Magnesium: 1380
Salinity: 1.025
Nitrates: between 0-10
Phosphates: between 0-5 usually
I do dose Red Sea trace colors and Acropower as well.

It doesn’t look like the tissue is being lost, just like they’re closing up in areas and turning dark blue/almost black. They still eat like normal when I feed them.

 

[CF12Valve]

Here are a few more pictures with one of them being edited to see them better.

 

[vetteguy53081]

Looks hungry. Other factors cab be:
High phosphate
High salinity
Insuffient lighting

Try offering it a couple pieces of mysis shrimp

 

[Steven Garland]

If you are saying your phosphates are really 0-5 and not .5 or .05 than phosphates can definitely be a problem.

But your other acan's look fine. Maybe a critter is living between the polyps.

When I fed,3x a week with a mixture of LPS Max,Reef Roids,Oyster Feast and dosed Aqua Vitro Fuel 2x a week my acan's would go from 1-2 heads to 6-8 in whew a matter of no time. Colors turned insane as well.

 

[rhostam]

If you are saying your phosphates are really 0-5 and not .5 or .05 than phosphates can definitely be a problem.

But your other acan's look fine. Maybe a critter is living between the polyps.

When I fed,3x a week with a mixture of LPS Max,Reef Roids,Oyster Feast and dosed Aqua Vitro Fuel 2x a week my acan's would go from 1-2 heads to 6-8 in whew a matter of no time. Colors turned insane as well.

I have yet to see any kind of feeding response from my acans. It’s always bummed me out because it’s one of my favorite activities to observe. Scoly, torches, anemones, etc. All eat. But I’ve never seen my acans extend their polyps.

 

[Steven Garland]

I have yet to see any kind of feeding response from my acans. It’s always bummed me out because it’s one of my favorite activities to observe. Scoly, torches, anemones, etc. All eat. But I’ve never seen my acans extend their polyps.

Really ? That is strange. Try spot feeding them and you should start to see a reaction.

 

[rhostam]

Really ? That is strange. Try spot feeding them and you should start to see a reaction.

I have tried spot feeding with a variety of foods. At night some tentacles come out, but they don't appear to respond to any of the food. Aquaforest Mysis, rehydrated mysis, Reef Roids, TDO pellets, tiny bits of shrimp. Nothing.

 

[HudsonReefer2.0]

polyp booster? Then feed @nite. Should feed mine more i I guess for @Steven Garland results.

 

[Steven Garland]

I used polyp booster for a short period,but no results so I stopped using it.

I am a firm believer in heavy in,heavy out on exporting from feeding so heavy. Especially since all I have ever kept was pico's and nano's. Phols Xtra worked wonders too with drab looking fleshy corals.