More Goldfish Questions (sorry)

Hello. I always seem to be posting on here for one problem or
another. This is really about an ongoing problem that I've had.

I have my 4 fancy goldfish. I suspect most of you feel like you know
them personally. Anyway, I had a problem with my Ryukin who was just
floating away in the middle of the tank. She was having a split tail
and very long thin white stools. Well the good news is that she is
sooo much better. She still has a couple of 'misty looking' scales but
is like her former self again. I haven't seen any more thin white
stools from my fantail either. The problem is with my black moor and
pearlscale. My black moor looked like he had fungus. He had had tail
and fin rot not long after i got him from the pet store. Its very easy
to identify on a black moor :-) My pearlscale has red streaks at the
end of his tail.

So I used Furanase for 4 days, 50% daily water changes and 1 table
spoon of salt per 5 gallons. After the 4 days the fantail and ryukin
seemed to be much better. The red streaks are still on the pearlscale
and the misty scales are on the blackmoor. Both are slightly lethargic
and often rest on the bottom of the tank. Yesterday I purchased some
quick cure to see if that helps. They are also eating antibiotic food.
The don't seem keen on this. I have also changed the water changes to
every other day. I think it was stressing them too much.

Is there anything else i can do for them? I am goign to start feeding
them normally tonight. I think a week on that awful food is enough.

Sorry to keep burdening you all with all of this. Will be so happy
when I can change the water once a week and just sit and enjoy.

Thanks in advance
Mellie