goldfish sick

I had problems with my guppy tank & betta tanks with ick, which is now under
control and they all look almost 100% better, but I think in the process of
doing water changes and feeding and what not I may have used something in my
big tank that I had used in one of those tanks when they were sick, not sure
what I used...... but something, so anyway I have a tank with a blue
gourami, a goldfish, 2 African dwarf frogs and a pleco. the goldfish and
gourami have been living together for two years now, have had no prior
problems in that tank, I added the African dwarf frogs and pleco about two
weeks ago, (I am aware of the fact these are not fish that should be
together but since they having been together so long I just kept them like
that)
Anyway a few days back I noticed my goldfish who is very big, I got him as a
feeder and he is now bigger then the fish in my neighbors pond, was not
looking good, his tailfin was not moving and seemed stiff or clamped ? his
top fins were laying down flat, and his swimming was a bit off, the other
fish seemed fine, the next day I noticed ick on the gourami and as I looked
close at the goldfish I seen a few spots, but he looked sick, were the
gourami was acting fine still, being more worried about the goldfish I
started looking info up on how to treat him, every thing I read said
something different, so I took ten level tablespoons to a gallon of water
and did a dip every 12 hours, and started treating the tank with rid ick+, I
had to remove the African dwarf frogs because of the meds, but any way, I
noticed a big difference in the first day, before I started he looked like
he would be dead with in a day, after he started eating, his fins were back
to moving, I am only on the second day, so I am hoping he stays on the same
course, and gets better, what I am wondering about is, ick goes in a cycle
right?? I know warm temp will speed it up in my guppy tank I had put the
temp on 82, but the goldfish don't like warm, so does that mean it will take
longer to treat the ick, and how much ick med can the pleco take from what I
understand they have a hard time with ick meds.
thanks nikki