Ryan.O.

i hav 3 harlequins in my 215L tank. 2morrow i am planning 2 get about 3 more harlequins. i have had the harlequins for about 6 months and they are bigger than the ones at the shop. will they all school together??

MrWaxhead

It really depends on your tank and your fish, but they would certainly be happier with more of their kind. Most fish school out of fear, when they are spooked by another fish in the tank or something in your house that moves quickly etc. But they will for sure be happier to shoal and hang with more of their kind, and have more security (peace of mind within their group) while schooling in a larger group.

Tom

They should school together with the old ones.
Tom

Isabella

I also think they should school together I am in the same situation as you, lol. I have 2 adult Harlequins and 4 young ones (in a Q tank) waiting to be added to the school of 2 adult ones to make a group of 6 (for now). I believe the larger the school of Harlequins, the more beautiful they look

Ryan.O.

i've had the school 4 about 2 weeks and they don't really stay 2gether. they just all go 2 diffrent partz of the tank. will they school when the small ones get bigger?

Tom

I have 8 at the moment and they don't all school all the time. They are usually all over the tank. Just give them time, it will take quite a bit of time for the older ones to get used to and accept the new ones as friends.
Tom

Sabi

Yup! Another agreeing that it'll take time. You are lucky there isn't any aggression ,ine fought with each other. From the 8 harlequins i bought at different times i have 4.

Tom

So, how are they doing now?
Tom

Ryan.O.

well 2 died and i think they were killed by my 2 angelfish. i probably will get rid of the angels and get 5 more herlequins so i hav a school 10.

MagpieTear

Not sure how similar the behavior of Harlequins is to tetras, but after about 3 weeks my Pristellas are finally starting to hang together. I added 4 to the tank back in Nov. 24th, they stuck together but just recently started following the older one I've had for a year. The new ones acted like they weren't sure what to do about a fish that looked like them, but was over twice their size.