i know a few people who tried it but it never seemed to work they always died very quickly i just think there wild fish so containing them in a small tank IMO just wont work that,s probably why you cant buy them in every pet shop like other tank fish
just swipe the box off the collar dont actually need the magnet on the nose of the box theres an arrow with a dot and same on face of collar just swipe the box across the collar
Heres one i made for the back of my opel zafira for the terriers and storage for boots and gear in the middle made from 1/2"
wbp ply keeps the car clean and made for about 25euro cant go wrong
got this fella last week for the young lad, pestering me for a lurcher for weeks now, surprised him with this little fella, a small bit of responsibility do him no harm