Stocking 10-20 gallon tanks!?

I do not know much about Barbs other than they are fin nippers, but I know a little about your 10 gallon stock. The Honey Gourami will be pretty peaceful in the 10 gallon because there is no other Gourami's, but there have been mixed experiences with honey Gourami's and Guppies getting along. The apple snail can get pretty big, so I would not put it in a 10 gallon. I had mine in a 10 gallon and it outgrew it. Every day I had to siphon it's poo out. Then I finally get a 29 and it is living in there now. It is the size of a baseball and laying eggs every week.