OK . Lets get down to facts, and forget all the crap written below.

Firstly, forget infection , You have one fish, with sore sides, If it was
an infection, other fish would also be showing signs of irritation, Which
there NOT.
You don,t say how big the Angel is, large ,small, breeding nic, etc.
Chances are, and as we haven't seen the fish, so we can only guess what the
problem is. But as I've kept Angels for close to 40 years. Christ is it that
long. No-matter. I would say , you have a breeding pair, and they have BOTH
attacked the interloper, one attacks while the other. sleeps, feed, rests,
then they swap over. and the marks on the sides are Bites.

Move it out, and feed heaps of Brine Shrimp, Blood Worms, Daphne,
If it starts to spawn, which it might do, if it's female. Cut out the Blood
Worms. Blood Worms are full of protein, I,ve had the little buggers
breeding when they where only an inch across, due to Blood worms.
Meal Worms are good, if you can get some, squeeze the insides out into the
water, if there shells are hard. or chop them up. Just about pure protein,
and they breed fast, use Bran, Stick them in a wooden box , in the dark.
with NO moisture. Bloody magic,

And don't start throwing Chemicals into the tank, If your not doubly sure
what your treating, No point treating a sore finger, when you have a broken
leg.

Build the thing up again, Might even grow it a bit more, It will recover,
don't overheat the water, leave it as it was before, It's weak, so rapid
temperature changes, will do more harm then good. Plus high temperatures
increase the heart rate, and use more energy, Which the Angel in it's run
down state does not need. While colder water will make it lethargic
What else do you have in the tank, apart from Angels, Is that a 90 imperial
gallon tank, or US gallons. very confusing this gallon difference.

Might be something completely unconnected to the Angels, Just watch the
others, in case whatever it is, starts attacking another Angel.
And we all know what thought did.
bassett

"Elaine T"
First, the fish wouldn't likely have true fungus without damage. Either
physical damage, or ulcers from a bacterial infection can fungus. Fluffy
white edged lesions may be flexibacter rather than fungus - does your
anti-fungal med have an antibacterial ingredient? Most do, because the
symptoms are so similar but doublecheck so you know you're treating for
either true fungus or flexibacter. Antibacterial food is a good call too,
and will help immensely if you're dealing with flexibacter. Feed for a
full 10 days. As for temps, I keep hospitals at 78F. Warm enough to
stimulate the immune system, but not to stress the fish.

I'd worry more about conditions in the 90 gal than trying to treat
seemingly healthy fish. If you feed antibacterial and antiparisitic food
to healthy fish, you will encourage resistant bacteria and your food may
not work the next time the fish are sick. Even worse, if you haven't
fixed whatever is stressing your fish, they will just get sick once you
finish feeding the medicated food.

You've listed ich, fin damage, and now fungus or flexibacter...
something's amiss. Patch of bad gravel or OTS come to mind. If you want,
you can post tank info and whoever is watching this thread will hopefully
help figure it out. Also change more water - do some extra changes of
whatever volume the fish are accustomed to.

--
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