logansmomma1228
Aquarium Advice Addict
How mayn gallons is your 42L? My 10gallon is a 40L I believe, so that would make yours a 12G??? If so, then you would be OK with one goldfish max IMO. They are pretty messy and they get real big. You seem to like them, though, so maybe you could look into getting a different tank altogether? Maybe a bigger one? Then you can cycle it and you will know that it is clean.