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Sixty liters is about 16 gallons for us Americans, I would say that already it is too small for your stock. Don't use the trap and let the babies live according to nature, if you keep them in the trap your tank will eventually be hugely overstocked.
Also, some of your fish could reach over four inches, which if this is the assumed taller footprint means you will definitely need at least a thirty or more, which is about 115 liters.