11-30-2008, 11:12 PM
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Hi Chips, and welcome to Fishforum! If you can answer a few questions, that will really help with the diagnosis.
First of all, when you say your tank is 30L, do you mean a 30 gallon long tank, or a 30 liter tank (which would be less than 10 gallons)? If it's a 30 gallon, we're fine. If it's a 30 liter, each of your goldfish need at least 10 gallons to themselves - a standard 29 gallon would be great.
Next, can you post your water parameters (ammonia, nitrite, and nitrate)? We need to rule out a water quality problem. Just because one fish is sick and not the other doesn't necessarily mean all is good with the water conditions, so it's best to make sure with a good test kit.
Additionally, what's the temp in your tank? I had a goldfish exhibit the same behavior during the summer time when I could not keep his tank cool enough. My goldies prefer about 68 degrees Fahrenheit.
What kind of filtration do you have with the tank? Brand and gallons per hour would be very helpful.
Keep us posted!