Sick/injured Blue-green Chromis?

I have 3 blue-green chromis in my tank. Normally they are highly
active, zipping around in the upper water column in search of food.
However one of them is now hanging listlessly in the upper corner of the
tank, head up, normal breathing rate. Its dorsal and pelvic fins are
ragged, not diseased looking like tailrot and finrot in freshwater fish,
more like nibbled off. Tail is fine.

I had a similar problem earlier when one of my two 3-stripe damsels was
being overly aggressive and nipping the chromis. Caught him and
returned him to LFS. Have never seen the remaining 3-stripe do the same
behavior, he's rather docile. At that time the chromises actively hid
in the rock work.

Besides the 3 chromis and 1 3-stripe the other fish inhabitants a
2 false perculas
1 mandarin
1 bi-colored blenny

Have never witnessed any aggressive behavior between them.
There is a single peppermint shrimp, completely nocturnal and a
detrivore crew of small hermits and snails

40 gal wide breeder, lots of well established live-rock and water
parameters good.

Any ideas?




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Perhaps a hermit was eating some of the fins while it was
sleeping. This has happened to some. How is the fish now?

Marc


Tom Rhindress wrote:

I have 3 blue-green chromis in my tank. Normally they are highly
active, zipping around in the upper water column in search of food.
However one of them is now hanging listlessly in the upper corner of the
tank, head up, normal breathing rate. Its dorsal and pelvic fins are
ragged, not diseased looking like tailrot and finrot in freshwater fish,
more like nibbled off. Tail is fine.

I had a similar problem earlier when one of my two 3-stripe damsels was
being overly aggressive and nipping the chromis. Caught him and
returned him to LFS. Have never seen the remaining 3-stripe do the same
behavior, he's rather docile. At that time the chromises actively hid
in the rock work.

Besides the 3 chromis and 1 3-stripe the other fish inhabitants a
2 false perculas
1 mandarin
1 bi-colored blenny

Have never witnessed any aggressive behavior between them.
There is a single peppermint shrimp, completely nocturnal and a
detrivore crew of small hermits and snails

40 gal wide breeder, lots of well established live-rock and water
parameters good.

Any ideas?




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Marc,

Even though you have not witnessed it, the behavior you describe is
typical of a fish that is being harassed. Have you tried removing this
fish and placing him in a separate tank? If you do this, you will
prove whether this is simply aggression or if there is somthing wrong
with him. If, after a day or two, he begins swimming normally then you
will know it is a case of aggression. If not, then you will know that
there is a condition you need to identify and treat.

If he is being chased, you can simply remove all of the fish, rearrange
all of the rocks and then re-introduce the fish. When you do this,
place the fish that has been in the corner first. Allow him some time
to explore and find a spot where he feels comfortable. Then you can
put the other fish in. You will need to watch all of them carefully.
Don't forget to check on them once the lights go off as some chasing
can occur then.

Let us know what happens. Good luck!

ck


In article , Marc
Levenson wrote:

Perhaps a hermit was eating some of the fins while it was
sleeping. This has happened to some. How is the fish now?

Marc


Tom Rhindress wrote:

I have 3 blue-green chromis in my tank. Normally they are highly
active, zipping around in the upper water column in search of food.
However one of them is now hanging listlessly in the upper corner of the
tank, head up, normal breathing rate. Its dorsal and pelvic fins are
ragged, not diseased looking like tailrot and finrot in freshwater fish,
more like nibbled off. Tail is fine.

I had a similar problem earlier when one of my two 3-stripe damsels was
being overly aggressive and nipping the chromis. Caught him and
returned him to LFS. Have never seen the remaining 3-stripe do the same
behavior, he's rather docile. At that time the chromises actively hid
in the rock work.

Besides the 3 chromis and 1 3-stripe the other fish inhabitants a
2 false perculas
1 mandarin
1 bi-colored blenny

Have never witnessed any aggressive behavior between them.
There is a single peppermint shrimp, completely nocturnal and a
detrivore crew of small hermits and snails

40 gal wide breeder, lots of well established live-rock and water
parameters good.

Any ideas?




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