YIKES!!!!!!
1. Did you condition the water? The chemicals that municipal water systems put into tap water are LETHAL FOR YOUR FISH.
2. Koi and GOLDFISH IN SIX GALLONS???? You are killing them.
Koi need at least 30-50 gal..if not a pond. Ryukins need 10 gal EACH. AT LEAST.
3. Did you cycle your tank? If not, your ammonia, NO2 and NO3 are going to shoot through the roof, and KILL YOUR FISH.
4. RETURN THE FISH. they are too large for that small of a tank.
5. Part of me thinks that you posted that for the sheer fact of ruffling ALL of our feathers.
6. RETURN THE FISH RETURN THE FISH RETURN THE FISH!!! I cannot say that enough!!
get a few...FEW...neons instead...or a FEW tetras. (NO MORE THAN 4 or 5).
7. Get a freshwater testing kit.
8. Get a thermometer
9. Get a gravel vaccuum.
10. Get water conditioner.
and lastly...DO YOUR RESEARCH BEFORE YOU PUT SOMETHING IN THAT TANK.