10 gallon tank... ok for black molly?

You might be able to go with just 2 males, that way no babies in the future. Of all the fish I have had, mollies are the ones that usually come with diseases. Never fails, they come and look healthy. Within days the pre-existing tankmate mollies get sick ( ich, etc.,)and then die. The new mollies also end up getting sick and dieing. Don't know why. I don't want to introdue any to my big tank for that reason.

hmm. maybe it's time to get a quarantine tank?
 
You might be able to go with just 2 males, that way no babies in the future. Of all the fish I have had, mollies are the ones that usually come with diseases. Never fails, they come and look healthy. Within days the pre-existing tankmate mollies get sick ( ich, etc.,)and then die. The new mollies also end up getting sick and dieing. Don't know why. I don't want to introdue any to my big tank for that reason.

Cramped mollies wil lead to aggression issues...two in a 10 gallon tank is a bad idea IMO...
 
A few male Platies may be a better choice. And you might read the cycling sticky above the freshwater newbie forums.
 
A 10 gallon is a tad small, because mollies grow pretty large and breed quite fast. For the 10 gallon, you could go with a couple shrimp, snails, and maybe a betta or a dwarf gourami. Or you could try the already stated platies or guppies...
 
AquariaCentral.com