Thanks! The amount is kind of in flux constantly, they're my favorite small schooler so I always get them when they're on special at my lfs and then push them on anyone I know locally who keeps fish. My lfs gets them wild caught so theirs always a bit of rehab I guess you'd call it. Deworming them and getting them eating or healed. I get really proud taking the small, pale, scared fish and turning them into a glowing, healthy and inquisitive specimen.
To answer your question, in that tank is I believe twelve or so. Seems like theirs always some in qt/hosp as well.
Generally, they resist the nls for a few days. After that, they are either hungry enough or they recognize it as food and start eating. If there's hold outs in the group I offer some brine shrimp or bloodworms just to get them eating and typically they'll start taking pellets shortly after, I think its partially getting them involved in the "frenzy" and then instinct takes over and they snatch up whatever is around.
I try to get them as soon as they come in but sometimes the lfs has them eating. I feed them nls thera+a .5mm size pellets. The other part about being wild caught is they're often beat up by other fish they were collected with, missing eyes and other wounds so I do lose quite a few.