Well I have to be honest, I start w/frozen brine and blood worms. I also use color flakes and freeze dried tubifex worms. I do the same for all types of food: first I put warm water in a cup and put the food in it for a couple minutes. The room temp foods, I break up before I put them in the cup, then every minute or so I push it down with my fingers. When it's ready I swirl it around with baster, suck it up and distribute in the tank. The tigers usually have each dose eaten before I can get the next one sucked up into the baster. The frozen stuff is the staple diet and the rest is supplemental. I know it sounds excessive, but that's the kind of guy I am. I also get live brine shrimp once or twice a month to feed them, now that is fun to watch.
When the barbus tetrazonas are that small, it is definitally nerve racking until they get bigger and more stable. If I can get mine to stay still I'll take a picture of a male, you want believe the brightness of the colors.
On a side note I had several other types of fish in my tank and decided to remove them so that I could put more tigers in. I went to a big time lfs to look and they had some labeled as large, and let me tell you they were hugh. They were obviously filled up with growth hormones and they looked terrible. The black stripes were very black, but the outlines were fuzzy and there were black blotches on the rest of the body. I hate seeing that. I am going to try to breed some tigers and red rudy barbs this summer.
55 gal., DIY stand, hood, rex reactor, & bubble counter, XP2, Coralife 65 X 4 w/remote ballast, flourite