Agressive goldfish

I recently bought a 10 G aquarium and after due cycling added 2
goldfishes (fan tails) about inch and half each. I added the 2nd one
after a gap of almost after 4-5 days. All aspects like NH3, odour, 24X7
external filter are fine & the fishes seems to enjoy it. But i have
observed for last 4-5 days ..one goldie (slightly larger in size) has
become agressive and keeps chaising the other one. he kind of tries to
bit the tail of the smaller one but i have not seen any damage caused
after carefully observing the tail of my smaller goldie.

Now they are fed well and kept well ,the aquarium has some decent
beautification (all artificial). The question is why this agression.
Are they close to mating age OR am I missing something.

Thanks
Kedar

Kedar wrote:
I recently bought a 10 G aquarium and after due cycling added 2
goldfishes (fan tails) about inch and half each. I added the 2nd one
after a gap of almost after 4-5 days. All aspects like NH3, odour, 24X7
external filter are fine & the fishes seems to enjoy it. But i have
observed for last 4-5 days ..one goldie (slightly larger in size) has
become agressive and keeps chaising the other one. he kind of tries to
bit the tail of the smaller one but i have not seen any damage caused
after carefully observing the tail of my smaller goldie.

Now they are fed well and kept well ,the aquarium has some decent
beautification (all artificial). The question is why this agression.
Are they close to mating age OR am I missing something.

Thanks
Kedar

I doubt they are breeding, as you already have a small aquarium for two
goldfish which is not very indusive to breeding.
You may just have one fish exerting dominance over the other.
You also may have a weaker, sicker fish being picked on by the other.
Check all your water parameters;
Ammonia- 0
Nitrites- 0
Nitrates- below 50 ppm
KH- above 80 ppm

Keep a careful watch on your fish.
Others here will probably have other suggestions.

Carl
http://aquarium-info.blogspot.com/

"Kedar" wrote in message
ups.com...
I recently bought a 10 G aquarium and after due cycling added 2
goldfishes (fan tails) about inch and half each. I added the 2nd one
after a gap of almost after 4-5 days. All aspects like NH3, odour, 24X7
external filter are fine & the fishes seems to enjoy it. But i have
observed for last 4-5 days ..one goldie (slightly larger in size) has
become agressive and keeps chaising the other one. he kind of tries to
bit the tail of the smaller one but i have not seen any damage caused
after carefully observing the tail of my smaller goldie.

Are you feeding them enough? GF that small are not likely to be breeding,
especially in an aquarium. In the USA this isn't the time they breed
anyway.

Now they are fed well and kept well ,the aquarium has some decent
beautification (all artificial). The question is why this agression.
Are they close to mating age OR am I missing something.

Thanks
Kedar

--
KL....
Frugal ponding since 1995.
My Pond & Aquarium Pages:
http://tinyurl.com/9do58
~~~~ }((((* ~~~ }{{{{(ö ~~~~ }((((({*

Thanks All,

Reg
Kedar

Köi-Lö wrote:
"Kedar" wrote in message
ups.com...
I recently bought a 10 G aquarium and after due cycling added 2
goldfishes (fan tails) about inch and half each. I added the 2nd one
after a gap of almost after 4-5 days. All aspects like NH3, odour, 24X7
external filter are fine & the fishes seems to enjoy it. But i have
observed for last 4-5 days ..one goldie (slightly larger in size) has
become agressive and keeps chaising the other one. he kind of tries to
bit the tail of the smaller one but i have not seen any damage caused
after carefully observing the tail of my smaller goldie.

Are you feeding them enough? GF that small are not likely to be breeding,
especially in an aquarium. In the USA this isn't the time they breed
anyway.

Now they are fed well and kept well ,the aquarium has some decent
beautification (all artificial). The question is why this agression.
Are they close to mating age OR am I missing something.

Thanks
Kedar

--
KL....
Frugal ponding since 1995.
My Pond & Aquarium Pages:
http://tinyurl.com/9do58
~~~~ }((((* ~~~ }{{{{(ö ~~~~ }((((({*