This is a discussion on First tank (19G) help! within the Beginner Freshwater Aquarium forums, part of the Freshwater Fish and Aquariums category; -->
A pair of Kribensis should work out as well with a shoal of Tiger Barbs. You would just need to have a source to ...
I've never tried that mix myself, but you'd have to be careful for sure. The barbs might really try to snag some of the fry and krib parents can be *very* aggressive about defending their fry.
Kribs aren't exactly the rarest of fish, but they're not livebearers, either. With that in mind, you should have no problems finding a store that will take them off your hands, but they may not give you very much for them (or anything at all). For example, I traded a batch of 34 1.5" kribensis fry to a store for a $13 container of flake food. I wasn't looking to make a profit - I just wanted the fry out of my tank.
I picked up the API full test kit today and pH tested good 7.4, Ammonia....... 1.0ppm YIKES! I got some bags from Petco when I picked up the kit. So back to the store the tiger barbs and gourami go. I will do a 50% water change and let the tank cycle with the lone cory cat. The stick on ammonia meter didn't work for beans.
Sounds like your on the right track. Just be sure that the ammonia levels stay down (not reaching higher than .5ppm if you can) since you already have a cory in there. I normally say to just let your tank run once you get ammonia, but since you already have a cory, I would be doing Water changes every day to be safe.
You are going to be controlling ammonia at lower than 0.5 ppm for now but as soon as that seems to be taking care of itself you will start seeing nitrites. Nitrites are also toxic and need to be kept at less than 0.25 ppm by again doing large water changes. Only when both ammonia and nitrites start taking care of themselves should you think about any fish besides what you already have.
If you lose the cory, which is entirely possible, do not replace him with any fish. Instead get some pure ammonia and finish cycling by adding about 1/2 teaspoon to your tank to obtain ammonia at around 5 ppm and monitoring daily to make sure the ammonia returns to zero. If your cycle has progressed at all, it will quickly drop the ammonia to zero on its own and you will need to add more ammonia the next day. The ammonia will convert into nitrites so you will monitor those also until ammonia and nitrites are both at zero within less than 24 hours. When both ammonia and nitrites are being processed by the bacteria in your filter, you could then do a 90% or more water change to get your nitrates back under 40 ppm and be ready to add your first fish.