i have few gold fishes and they always are together at the corner of the tank at the same time all the time?

Answers:
Check to see if that corner is at a different temp. then the rest of the tank. You may need to add an air stone to circulate the water more ( and they love playing in the bubbles).
A

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It's called schooling. All fish do this.

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Mine do the same when they're in that non-sleep-sleeping stage. I think it's just part of their genetic make up that they'd school together when sleeping, hoping that one would awaken and raise the alarm to the others if a predator was getting too close.

Or maybe I'm just anthropomorphising.

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Hmmmm..I think something fishy is going on.

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try putting in more plants and rocks in the water the more you have the more places they have to go to.

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I'M SURE WHEN THE FISH ARE MORE COMFORTABLE WHEN THEY ARE TOGETHER. gATHERING IN THE CORNER LIKE THEY ARE PROBABLY JUST MAKES THEM FEEL MRE SAFE THAN BEING OUT IN THE TANK ALL ALONE.

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Water quality problems. Do an immediate partial waterchange makeing sure to not go past 50 percent and make sure the new water is dechlorinated and the same temp as the tank water.

WHenever a fish is sittin on the bottom or gasping at the top or there is redness around gills and fins, it is a sign of bad water quality, either high ammonia or high nitrites. What size tank is it and how often do you do partial waterchanges.

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I agrees with Lady_crot, nena and those who talked about schooling. but to ad to Lady_crot. you might also need to check your water temp, and circulation. gold fish are tough cold water fish, but they have thier limits too. a small filter and air pump can do a lot of good with a water change.

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If there in the corner there just behing closer because they feel safer closer with a bit of time and food they'll get used to it

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its normal