silver dollar attack - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 9 Old 02-12-2013, 07:08 PM Thread Starter
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silver dollar attack

I bought 2silver dollar fish I put them in my tank and the fish attacked them I have a blue gurami and some koi ,a shark ,a dragon eel ,danuao ,guppy and gold fish
The gurami and the gold fish were the attackers the killed one before I could pettition the tank now the gurami keeps bumping the pettion trying to get to the silver dollar. Why?
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post #2 of 9 Old 02-12-2013, 07:12 PM
What size tank is this? What are the water perimeters? Also when you say "Dragon eel" what is it's real species name?
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post #3 of 9 Old 02-12-2013, 07:15 PM Thread Starter
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70 gal. Don't know what he is he wasn't the problem it was the gurami and the gold fish
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post #4 of 9 Old 02-12-2013, 07:42 PM
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You have a mix of fish that are not compatible. First, goldfish and koi should never be in the same tank as any tropicals. Second, gourami can be aggressive; without knowing the species (there are many species of gourami) it is possible you have a male and it views the Silver Dollar as another "gourami" because of their basic shape, and the gourami is making it clear he doesn't want them around his territory.

Some fish need to be in a group, some in pairs or singly.

Have a read of the profile for the species you have, under the second heading from the left in the blue bar across the top of the page. They will explain the needs of these various fish.

Byron.
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Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #5 of 9 Old 02-12-2013, 08:03 PM Thread Starter
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You have a mix of fish that are not compatible. First, goldfish and koi should never be in the same tank as any tropicals. Second, gourami can be aggressive; without knowing the species (there are many species of gourami) it is possible you have a male and it views the Silver Dollar as another "gourami" because of their basic shape, and the gourami is making it clear he doesn't want them around his territory.

Some fish need to be in a group, some in pairs or singly.

Have a read of the profile for the species you have, under the second heading from the left in the blue bar across the top of the page. They will explain the needs of these various fish.

Byron.
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post #6 of 9 Old 02-12-2013, 08:03 PM Thread Starter
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Why did the goldfish attack
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post #7 of 9 Old 02-12-2013, 08:10 PM
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Why did the goldfish attack
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Possibly due to stress. When non-compatible fish are combined, it causes them stress, and this often leads to increased aggression even from peaceful fish. They are frustrated.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #8 of 9 Old 02-12-2013, 09:55 PM
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70 gal. Don't know what he is he wasn't the problem it was the gurami and the gold fish
You have a fish and you don't really know what it is? How can you do research on it if you don't know? If it is what I think it might be, it could be a stressor on the other fish.
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post #9 of 9 Old 02-13-2013, 01:52 PM
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Why did the goldfish attack
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I agree with Byron. Stress can cause normally placid fish to lash out. Goldfish are not aggressive fish and shouldn't be behaving in this manner. The tank size is actually fine for goldfish (but not koi... they need 500+ gallons per fish), but the tank mates are not.

So simply put, the goldfish attacked because something is wrong with your setup.

---Izzy

Sitting by the koi pond

writings on fish and fishkeeping


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