fancy tail goldfish eat other fish? - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 13 Old 04-07-2011, 05:50 PM
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Originally Posted by aura09 View Post
gold fish ARE coldwatere fish and exposed to high temps although they will be able to survive in warmer water is bad for them over the long run messes up with there insides so def keep them in a goldfish only tank with no heater :)
An unheated tank is not the same thing as a coldwater tank. In many cases, unheated = subtropical. Coldwater generally means 70 degrees or less. I think most people don't keep their houses in the 60's, so how would you expect someone to attain these coldwater temps? Maybe there's someone here that does, but I've asked on other forums how many goldfish keepers have chillers on their tanks. None of them do. None.

Moreover, there seems to be a great debate over whether the fancy goldfish like are "coldwater" fish as well. I have heard compelling arguments stating that the egg shaped goldfish do best in warmer water. Your claim that warm water "messes up with their insides" is rather vague. What exactly goes wrong? How is the water temp responsible? You can't just make claims without at least explaining why you think it's the case. The truth of the matter is that they are ALREADY prone to internal organ issues because of their physical deformity. I don't know how you can attribute something like water temperature as the cause when it's a pre-existing condition.

I'm not advocating goldfish as a tankmate for discus, but rather pointing out that this notion of what coldwater is is a little misplaced.

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post #12 of 13 Old 04-08-2011, 07:00 AM
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I administrate an advanced goldfish forum, GAB. You will find that all of the moderators there in collaboration with the koi vets and staff there have reached a consensus that goldfish are NOT by any means considered coldwater fish contrary to popular beliefs anymore. That is not the case anymore with centuries of adaptation in various areas especially the tropical climate where they have been raised. A majority of goldfish sold came from the tropical areas of Asia.

Subtropical is the correct way to categorize their temperature preference. You can argue that warm water ages the fish in general fast which is definitely true, however, your argument that it messes up their insides does not support what you are trying to say. There is absolutely no evidence that it can damage their insides other than the fact it metabolizes them fast resulting in faster growth and even aging. It is hardly expected for them to survive a very long time seeing as they are already vulnerable to health issues in the first place as a result of constant experimental breeding that renders some varieties incapable of surviving on their own without the assistance of their owners. In rare cases, we do see fancies surpassing the average length from 15 to 43 years on record. This however is NOT the norm. Very few are lucky to see their goldfish go through this.

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post #13 of 13 Old 04-08-2011, 01:11 PM Thread Starter
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thanks for all the info, i have cleaned the tank and changed the water yesterday and can't find any different evidence, so i assume its the goldfish, i will not be buying and more smaller fish to put in this tank with them. p.s. i keep the tank at about 76-78, so i believe that i'm on the high side for goldfish and lower side for any tropical fish. everything else seems to be doing fine together.
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