Now just this morning I realized how sick my fish are when just yesterday they were fine. I had noticed a little red but not as bad as today... One out of my 6 goldfish died already, the one I had for 4 yrs, 3 almost dead barely even moving. Some fish's tails are bloody red while others are almost all red. What can I do to save my fishes I am extremely sad and going crazy... Help... :(

Quick Reference: Goldfish Illness | Illness and Treatment (http://thegab.org/Illness-and-Treatment/quick-reference-goldfish-illness.html)