Common reasons why fish will school in my aquarium(same species)?

UnderwaterMeditation

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I recently have acquired some rasboras and have noticed they school sometimes and other times drift off in small groups doing their own thing? What causes theses behaviors?

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Butterfly

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Welcome to FishLore!

I believe Rasbora are more shoalers than schoolers. Schoolers swim almost in formation, shoalers will swim as a loose group and occasionally swim off alone. Hope that helps.

carol
 

Coradee

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As butterfly said, rasboras are more a shoaling fish rather than schooling.
Schooling is a defence mechanism, in our tanks there are no predators (hopefully) so the fish feel safe & have no need to stick tightly together all the time.
 

jetajockey

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There are not many, if any true schooling freshwater fish. Of course that comes down to how one would define schooling. As mentioned, it's a defense mechanism. I define schooling as the entire group acting as a single unit, or a single 'hive' type mind. This is best evidenced in large schools of bait fish out in the open ocean. And I define shoaling as when fish are social with one another, hang together in groups but still act independently in their movements and behavior.
 

Butterfly

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Excellent links Aquarist ! I had forgotten about posting those LOL

Carol
 
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UnderwaterMeditation

UnderwaterMeditation

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So my rasboras are shoaling fish, so my next question is in a 30 gallon with one angel how many should I have in there so that they feel comfortable in their own group (the angel is medium-sized).
 

Butterfly

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Harlequins are wonderful. I would add at least 6-8 for them to make a good showing.

Carol
 

LiterallyHydro

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I love Harlequin Rasboras. I have 7 in my 20G Hex! I love their personality and the way they look in the tank.
 
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UnderwaterMeditation

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I have 7 of them and am excited to see them in my tank, what plants would be good for them?
 

Butterfly

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They love anything tall enough to swim in and out of.

carol
 
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UnderwaterMeditation

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It seems that I may have one dud in the mix of rasboras. One of the fish seems to be either horrible at schooling or a nonconformist, what should I do with him? Replacement? Maybe fish school? Are there any other individuals who have seen this behavioral problem?
 

Butterfly

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Remember rasbora are not schoolers. they are shoalers, which means they may go off alone occasionally

Carol
 
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UnderwaterMeditation

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Butterfly said:
Remember rasbora are not schoolers. they are shoalers, which means they may go off alone occasionally

Carol
This is happening when they are all schooling, he seems to always be doing his own thing and doesn't school well, hes smaller than the rest of them so I think he may be underdeveloped.
 

Butterfly

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LOL I've got a couple that just wander around doing their own thing.

Carol
 

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