I stopped at Petsmart today and I found some more tropicals that I love

I never noticed how beautiful the regular black mollies are! Do they have to have salt in their water? How many friends do they need to be happy? Can I stop them from breeding? I also saw some pretty goldskirt tetras! How many friends do THEY need to be happy? Will these two fish get along with eachother and a small school of black neon tetras? Will they all fit in a ten or 12 gallon tank? I might have a betta, or a pair of dwarf gouramis in there with the tetras. Just some more ideas

I NEED to get a group of black neons (four or five) since I've got two already. I'm just fooling around with ideas lol. I don't even have the right tank yet..I'm searching the classifieds for a cheap 10 or 12 gallon and a cheap 20 gallon too for a couple goldies

Anyone know if these combos will work and have enough elbow room? I definately don't have the money right now, but I'm still dreaming!
BTW, I ALMOST got a ten gallon with lights, top, and penguin filter today for 25 dollars. I see it in the paper, but by the time I called the guy back a second time, all four were sold to some guy

(in an hour!)