I've ~50
M kubotai in one tank, no jumper losses to date & no signs of any interest in such activity (these were listed as wild caught)
In contrast my
P simulans are seriously shy, I began with ~20, then added another 17 or so (last the shop had) ... not much change ... they're everywhere IF no one's about (or one sits very, very quietly)
- this is a wild caught group; I had a few jumper losses when kept in the small Q tank, but no signs of jump activity in the wider,taller tank
Generally the dwarf Cory's are much more outgoing when kept in large schools ... begin with ~20 if budget allows (& more if possible) - C hastatus seem to be the most mid water oriented