06-13-2012, 02:21 AM
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The main points I'm seeig as causing a problem is the size of your tank, how many fish you have, and your water changes.
Like said above, goldfish get really big, and need a 55 gallon tank, even when small! Goldfish are notorious ammonia factories, as they poop a lot!
Your goldfish might be small now, but even in a 20 long, they are cramped and suffering. The old saying that a fish kept in a small tank will stay small is true. On the outside. On the inside, they are still growing, and that growth in a small body harms their internal organs and makes them very prone to sickness.
For all your fish, you should have a 150 gallon tank, and that would have them set for life.
Water changes are an important part of having a fish tank. I am not sure if your tank has cycled, with it's bio load, so I'm going to assume it hasn't. Even if it has, ammonia will rise more quickly with that many fish, and without weekly, or in your case, every other day water changes, your fish will slowly get sicker and sicker and eventually die.
Since your 'sick' goldfish is separated, i would suggest doing 50% water changes every day. You should see a drastic improvement. Make sure to treat each water change with a conditioner, chemicals or minerals in the water could kill your fish within minutes in its weakened state.
For your main tank, I would suggest doing gradually working up the water changes from 20% w/c then the next day 30%, and so forth, because your fish have been in dirty water for so long they have grown accustomed to it. Gradually working up the w/c's will help not to shock them.
Also, I have not used melafix, but many people in the hobby say that using melafix is actually useless. Clean water, and using aquarium salt in dire situations is usually all that is needed.
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