new fish quarreling with each other!
Hey all. I have recently (yesterday) purchased 7 zebra danios and 2 albino corys for my ten gallon tank. The first 24 hours seem to go smooth other than typical nervous introduction to a new environment. It wasn't until i just fed the fish - that any problems were apparent to me. The fish seem to be squabbling at first the betta looked like he was simply defining his territory to the danios. There is no more quarrel between the betta and danios, however the danios seem to be going at it with each other. Is there a dominance issue being sorted between the danios? I do not want to do wrong here by the fish. The 2 albino cories seem to be doing fine and the oto is business as usual.
P.S. I do have an empty 2.5 gallon that can be filled for emergency if any. I am also going to go lights out to lessen any tension.
Update: the lights being out for several minutes seems to have calmed the activity in the tank.
It isn't known by many but danios are very social fish. Most think that the little "minnow" fish just eat, sleep, poop, and try to stay out of the way. But, they do have a social structure and the males will often "flare" and show all their fins and circle each other to establish dominance. Their fins aren't long enough to be at risk of damage and their mouths are too small to hurt much. Add this to the fact that Zebra Danios are about as hardy as they come and there isn't any real danger in their rivalry.
Agree with Russell. Normal behaviour in most shoaling fish which is one reason they need to be in a group--this "activity" actually makes them feel more at ease and not stressed.
Your main issue is the betta. I assume it is a male. Betta are really not community fish; they are deserving of their own space. If you can move him (that 2.5g with plants would be excellent), I recommend it. He is likely as time progresses to take more interest in getting rid of his opponents, which is how he views the danio. And they may take a fancy to nipping his fins which will stress him out.
Agree with above, Danios are super active fish that enjoy interacting with each other and though it may seem that they are being rough ,a close examination of their fins will show little to no damage.
I too would remove the Betta assuming that you wish for the Betta to remain healthy.
I offer this due to the fact that there isn't much that swims ,,faster at grabbing food at feeding time and the Betta will be at a serious disadvantage at feeding time.
Danios also prefer cooler water than most Bettas appreciate and need LOT"S of swimming room.8-)
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