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Discussion Starter · #1 ·
So currently I have about 10 harlequin rasboras and around 15 cardinal tetras and neither of them swim around the tank at all, at least not when the lights are on, or that I can tell. (tank is 37 gallon) 30X12X23.

When I first got he Harlequins and had them quarantined in a 10 gallon they swam all over the place, same with the Cardinal tetras now they just sit either in the corner (Harlequins) or at the bottom (cardinals)... Any idea why?

Do I need greater numbers of each?
Seems what ever fish I get they just sit in the corner.
 

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I have a newly set up 20g and without knowing how sensitive they were to new tanks, I bought 10 cardinals. They hid behind plants until the room was empty or lights went out. This was just last week.

I started to feed their 3 guppy tank mates a pinch every time I walked by with hopes of them coming out to eat. They now swim freely whether someone is in the room or not.


Seems what ever fish I get they just sit in the corner.
It may also be your water parameters.
 

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Discussion Starter · #3 ·
I have a newly set up 20g and without knowing how sensitive they were to new tanks, I bought 10 cardinals. They hid behind plants until the room was empty or lights went out. This was just last week.

I started to feed their 3 guppy tank mates a pinch every time I walked by with hopes of them coming out to eat. They now swim freely whether someone is in the room or not.




It may also be your water parameters.
I've had them for over a year so I think they are use to the tank, my water parameters are good I mix RO w/ tap water to get 3-4GH and 6.3~ PH. I do weekly 50% water changes as well. The Harlequin Rasboras were really active when I first got them in my 10 gallon Q-tank but since they were put in the larger tank they just hide. (Cardinals weren't Q'd)
 

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well the tank is small compared to the wild. They school when they see danger or feel threatened. They can see each other at all times so they have no need to school shoulder to shoulder. I find my tetras stay near each other more than they stick to other species.
 
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