Goldfish Illness

Question
I have two goldfish that were given to me for Christmas 2010 by my nieces.   I started noticing swim bladder issues with the calico colored one "koi".  So i began researching and discovered that feeding peas is helpful.  That seemed to help!  He is still not quite swimming well though.  He has started spending most of his time at the bottom of the 10 gallon tank, seems to have an internal bacterial infection and has lost a little bit of his tail.  
I also noticed the orange one "little" has some odd growth/bulges on her sides in odd places and the skin in those places looks like it's red/irritated.  Looks a little like sores but I don't see anything she could have hurt her self on.  

I have them in Tetracycline, following the directions on the box.  Today is the fourth day.  The orange one seems to be getting a little better.  She's never changed in behavior just those bump/bulge/sore type things ....and they seem to be getting smaller (not sure but I think they are getting smaller).

The calico one is still hanging around the bottom.  He IS more active and DOES attempt to swim around but always falls back down to the bottom.  

My MAIN CONCERNS today are the calico fish having very quick respirations (yesterday and today) and some new "thing" seems to be oozing out of his body right behind his left gill (so close to the gill it could be coming from the gill but It don't think so).  I'm not entirely sure if it's coming from his body or what it is doing there.  It's a white-ish yellow and sort of cloudy like --  Oh, wait... it just came off.  it's not on him anymore.  It's on the bottom of the tank.  I have no idea what that is but it's kind of gross and i am concerned about "Koi".

What is going on with him and what should I do??

Should I take him out of the Tetracycline?  Today is the last of the four day treatment.

Please feel free to tell me anything you think I should do with these fish and what you think may be the problem.

Until recently I used filtered water for them.  I have a filter on my tap and I use filtered water for them along with Tetra Aqua Safe Water Conditioner.

Answer
Carolyn,
The main problem I see is the size of the tank. One goldfish should be in a tank no smaller than 20 gallons, with 10 gallons per fish added. This means, to house these fish properly, they should be in a tank no smaller than 30 gallons. Goldfish are huge waste producers and need as much water and space as possible. How often are you testing your water, and doing water changes? The redness could be ammonia and/or nitrite poisoning. This is why it is important that I know about the water. Since that one fish has red sores, I would do a large water change of 50%. As for the filter, it really should be for a larger tank. This will help with waste filtering. Once you get back to me with the answers to the questions, I can help you better.