A 20gal would be good , 6 would be very happy in it .
The males like to hide out a little , the females are more social , mine are any way.
If you get both sexes they will breed
, the male looks after the eggs , when they hatch he will promptly eat the fry . Mine have many times .
I haven't made a serious attempt to try and raise any fry yet .
As for the frozen food , I don't know , I haven't offered any to them .[ They'd probably eat it ]
So far they have eaten live brine shrimp , live mosquito larva , freeze dried brine shrimp , freeze dried blood worms , freeze dried daphnia and crushed freeze dried krill .
They never touched any kind of prepared foods flakes , pellets , none of it
.
They like the water wet
, easy to care for as far as water chemistry, they like the water pretty clean though , if you are good with regular maintenance you shouldn't have any problems .
They can be a little nippy .
They love plants , caves , rocks and things like that .
Good luck , it took me a while to find them , look for them with rainbow fish , that's where I found mine .