First it started walking and ended up in the cave in the left corner of my tank. It stayed there for several weeks, did not open much... then it started to walk on the interior of the cave aimlessly. So one day when I saw it on the sand attached to a small rock I moved it to a lit area of the tank on the right side. It quickly attached to the large round piece of live rock there but over next several days moved to the left side of the rock to the shade again. It got somewhat normal coloration for some time but becomes smaller and smaller, does not want to eat.

Is there any way to cure it whatever is its illness?

I am attaching pictures to illustrate overall view of the tank and the condition of other organisms:

Right side where the sick anemone sits currently (note pink arrow pointing at the anemone clone #7):

Zoomed in the cave:

The patient:

The patient up close:

Do you have any suggestions how to get this guy into a healthy condition?

I saw this happen in my tank from time to time when I was keeping these anemones, and to be honest with you, when they have been in the "not-feeding" mode for several weeks, I think they are doomed. Bulb tips appear to have an innate response to bury thier column where it won't get much illumination.  They then use the zoox in their tentacles for some day to day energy input and depend upon food for the majority of their nutrition.  However, some animals without zoox seem to get "short-circuited" and never seem to go through the normal feeding response.

About the only thing I can suggest is to try to feed the tank something like live brine shrimp and hope that it ingests enough of them to start the normal feeding responses.

Sorry not to be of more help.

Cheers, Ron

"The difference in mind between man and the higher animals, great as it is, certainly is one of degree and not of kind. The love for all living creatures is the most noble attribute of man." Charles Darwin (1809-1882)

But today I saw it move about 2" along this rock - I would consider this a progress after being dormant and shrinking over months. The tentacles look also little bit better. I see at least 2-3 which are nice and round, but they are on the maybe 25-30% of the oral disk - the rest of the oral disk seems to be still almost bare, with no tentacles.

I will keep target feeding it, hoping it will recover eventually...

Here is how it looked today:

Good luck!!

Cheers, Ron

"The difference in mind between man and the higher animals, great as it is, certainly is one of degree and not of kind. The love for all living creatures is the most noble attribute of man." Charles Darwin (1809-1882)

I have a home made lamp powered with 2 36" 96W power compact lamps. One is 10000K, the other is Actinic one. The lamp fixture is very old, and the reflectors made of strips of mirror glass are peeling off, so the light is not great.

In terms of feedings, they get plenty of food with fish/hermits feeding, breeding pair of clownfish take good care about the anemones being fed a lot :-) Occasionaly I target feed the anemones with 2-3 krills per head.

All other anemone clones are doing excellent, growing fast - the only one is sick, but after I saw it eat I have hope it will recover eventually.

Pszemol.

If it is eating, I think it will recover. 

We know little of the "mechanics" of the cloning process in these animals.  Sometimes I think there is a "critical mass" process at work, that the resultant clone needs to be of a certain size for it behave properly.  These animals have a net-type nervous system; no brain or ganglia, and all behavior is reflexive.  Perhaps they need to have either a certain number of nerve cells present in the clone for all the behaviors - such as the feeding responses - to be manifested.  Or perhaps, each clone needs a certain percentage portion of the parent's nervous system to make it.  That could mean that small clones or clones of the wrong "fragment" just don't have what it takes to survive.  If they have enough mass after the clone, to grow the appropriate cells in the appropriate pattern to trigger the response, the clone finally will "perk up" and survive.  If not ---

Cheers, Ron

"The difference in mind between man and the higher animals, great as it is, certainly is one of degree and not of kind. The love for all living creatures is the most noble attribute of man." Charles Darwin (1809-1882)

Anyway - I feed the tank with flakes today and I decided to give the little guy a chanse. I have squirted small amount of water+ formula 1 flakes mixture to shower his oral opening and I noticed a healthy feeding response.

The animal wrapped up and bubbled into a ball with flakes inside. This is very promissing considering how bad was it...

Thanks for the interest and your help.

Pszemol.