You can breed Congo Tetras like any other tetras. I just put a tank
divider (glass is perfect) in a 33 gallons. Males in one side and females
the other side. Feed them plenty of live food, beefheart, amphipods (they
love it!), brine shrimp.... After two weeks, I make a 80% water change,
put the heater on (80F) and put a lot of java moss on the bottom. Remove
the divider. Let them together for 2 days and remove them from the tank.
Fry will swim in 1 week. They take brine shrimp as first food. They grow
faster than many tetras but I didn't experience good results with frequent
water changes in the fry tank. One female can easily give you more than
300 eggs.
Good luck
-- Patrick Bessette email: killie at cam.org http://www.cam.org /~killie