i had 6 about 4yrs ago in the same tank they were in a shoal for about 1 day then i woke up to find one dead then the day after another until i had just 2 1 at 1 end of the tank the other one at the other end
they both used to go to the middle of the tank and go to war basically i ended up with 1
it may work if you get say 40 in a 100g tank but it will be expensive if it goes wrong