Clip On Aquarium

[Discuslove]

I saw these somewhere, not really sure what they are called. but people clip on these little plastic aquariums to the side of their big tank and normally you keep fry or moss or MTS in them. Does anybody know what i am talking about and what they are called. Looking for some on ebay but dont know what they are called to look them up.
 
http/www.ebay.com.au/itm/Starpet-Satellite-Breeding-Box-for-Shrimp-and-Fish-1-2ltr/171117853645?rt=nc&_trksid=p2047675.m1851&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D163%26meid%3D1273661892194960925%26pid%3D100005%26prg%3D1088%26rk%3D1%26rkt%3D4%26sd%3D281165842714%26
 
im pretty sure i found it, how do these work?

 

[SmexxyNick]

I have no idea but i just got a really good filter idea tho ahaha

 

[Blondielovesfish]

Breeder box?

 

[Discuslove]

i worked it out by watching a few videos, an airpump gets plugged into the intake and thats what makes the water flow.