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I have 110 gallon (420 liter) tank, which contains 1 ranchu measuring 13 cm, 1 ranchu measuring 10 cm, and 1 oranda measuring 8 cm. The oranda is gasping for air, while the other fish seem fine. There is aeration in the water. What's wrong? What should I do?

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    Did you recently put in any plants or rock as or wood or other fish/shrimp/snails in your tank? If so, it may be that umm... a parasite is affecting your goldfish... – Flyhighwhiskers Feb 2 at 9:56
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    can you please add the result of your latest watertest and edit the information into your question,the most important readings are nitrite,ammonia and ph. – trond hansen Feb 2 at 11:45
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First thing you should do is isolate your fish on a medic tank just in case it does have an infectious disease it could transmit, but also for you to be able to give them some treatment without affecting the rest of the population in your tank.

Secondly, observe very well. Take pictures and look for anything different than usual. White dots like sugar, inflated bladder, tumors, etc. Observation is a key factor here.

Third, based on that, an appropriate treatment could be applied.

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I know you fish is an indoor fish, but all fish have similar needs. Our outdoor Koi have many of the same needs. I agree with Omar and Lila. Our pond was built incorrectly and we had to get extra and better equipment to filter the water and add new water from waterfalls as the fish grew from 9" to 20". Test the water weekly and assure that your fish have clean, fresh, aerated water, with minimal algae and well balanced Ph. Some fish are more resistant to problems that others. Your Oranda is obviously stressed. A fish should not be at the surface for extended periods unless they are eating. Your Oranda, may be sick or may be trying to get oxygen which they get out of clean, fresh, aerated water, free of algae, so you may be having a problem with your filtering. You should consult your aquarium expert for your tank as soon as possible as this could be a serious problem.

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    Welcome to Pets, thanks for mentioning my name, but all the credit for that related answer goes to Omar as I am not a co-author of that answer, I only applied minor improvements ^.^ – lila Feb 5 at 17:23

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