Tank Size? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 2 Old 12-10-2010, 11:45 PM Thread Starter
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Tank Size?

Hi I have just obtained a 37 gallon tank and it is now housing 2 orandas, I also have a 10 gallon tank holding another one. Will the 37 gallon tank be alright to hold all 3, so I can set aside that 10 gallon as a medical tank?
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post #2 of 2 Old 12-13-2010, 01:11 AM
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That 37 gallon tank is only temporary even for 1 oranda. This is a fish species that grows 7 - 9 inches in length and will be as big around as a baseball (or larger) when full grown. The 10 gallon for a quarantine/hospital tank for an oranda is even more temporary. If the fish are healthy they will grow very fast, and by the end of a few months should not comfortably fit into a 10 gallon tank.

For 3 adult orandas (if healthy should reach adult size within the first 2 - 3 yrs) you should expect a minimum of over 100 gallons unless you desire water changes every couple of days.

If its any example to offer, I have an adult oranda/ryukin mix goldfish named Freddy. He is currently in a 120 gallon tank by himself with some rams horn snails and it takes 2 - 3, 25% water changes/wk to keep him healthy. I have just set up a 215 gallon tank for him, he will be moving there before Christmas. The 215 gallon tank is still only large enough to keep maybe 1 other adult goldfish with him unless I wish to go back to the heavy maintenance schedule to keep them clean.

Goldfish can be a lot of work and are not the easiest fish to keep. Fancy goldfish such as oranda, ryukin, lionhead, etc. all grow to 7 - 9 inches if healthy and have a life span of about 25 yrs. The smallest of the fancy goldfish would be the black moor, which still reaches an average adult size of 6 - 7 inches.. and can still grow the full 9 in some cases.
Goldfish are one of the dirtiest fish in terms of waste output and eating habits, which requires a lot of water changes and large water volume to keep them healthy. In smaller tank conditions these fish are prone to bacterial and fungal infections, tumors, and swim bladder disease. Most of these problems are brought on by less than pristine water quality. Because goldfish are sensitive to many medications, it can be very difficult to help them once the problems set in.

Most people have never seen a full grown fancy goldfish. Due to a lot of misinformation floating around out there about them, most of them die long before they reach adult size, and many of them suffer internal damage when their growth is stunted... again, by poor water quality due to tanks that are too small.

The other important thing I can offer you about goldfish that is often missed is that they require a very large amount of oxygen compared to most other aquarium fish. Warm water temps contain less oxygen than cold, so its important to keep their temperature in the appropriate range of 63F - 68F and to not overcrowd them in an aquarium.

My best suggestion to you would be to either return/exchange these orandas for fish that are more appropriate for a 37 gallon tank or to invest in a much larger tank (over 100 gallons) within the next 5 - 6 months and get them moved as soon as possible. The 37 gallon could make an appropriate hospital tank through to their adult size, provided the needed maintenance is done in water changes and filter media to keep it clean while the fish is in it.

Dawn Moneyhan
Aquatics Specialist/Nutritionist
Juneau, WI
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