07-15-2012, 09:33 AM
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I'm not sure about congo, specifically, but I think most tetra like to feed in the mid levels of the tank - my (wildcaught) tetra WILL NOT TOUCH anything that is on the substrate, so sinking pellets are out! I'd try some wet-frozen Mysis - that's what mine really seem to dig right now, and move onto a flake food once they become acclimated to your tank and comfortable with their new tankmates.
Feeding in the dark is definitely a good idea - not necessarily AFTER dark, like, outside - but just with the tank lights out. I leave the hood lights off for a day or two any time I get new fish, it helps them calm down and acclimate more easily, it seems. . . bumping up their shoal is a great idea, and my guess is that once they get used to things, they'll be begging for food however bright the lights are!
I know that lots of the congo tetra are wild-caught. . . have you asked the store were they came from, and what they were being fed while they were there?