Yes, it is very possible... although a 10 gal isn't ideal, especially for CRS breeding. Very hard water would also make CRS difficult.
The easiest and bet bet might be RCS. They breed like crazy, and sell for a decent price on ebay a/o aquabid. You aren't going to make a ton of money with a colony in a 10 gal tank, but you will be able to sell a batch or 3 every couple of months and keep a decent colony going.
If you get an RO system, you could set up a larger tank and do CRS breeding... there can be a good deal of money in that, but there is risk involved as the care is much harder, and they can be finicky to breed. I would start with neocaridina species of some kind, and then consider moving on to caridina as you get established.