10 litre? that's small.
Lemon tetras are also easy to breed, rummy noses I have found easy too. I'd start with glowlights though. Separate males and females, condition on live/frozen food for about 2 weeks, put female in spawning tank half hour before male, check in morning for eggs. Allow about 48 hrs to hatch. For a few days they'll feed off their egg sack then start feeding them infusoria, liquifry, baby brine shrimp.