Butterfly cichlid.80 liters is only a 20 gallon tank, so I think you're already close to full: I don't recall how big Butterfly Fish get (we are talking about pantodon bucholzi here, right? If not, ignore me. :grinyes, but golds hit 4" or more. That plus your Neons and I think you at the limit for your tank, even over-filtered.
But, to answer your question, if you had a larger tank, I'd have 2-3 females with the male. Golds can be aggressive.
Butterfly cichlid.It's blue ram (Microgeophagus ramirezi).
Hehe..Doh! :lipssealedsmilie:
Shows what I get for replying late at night. I'm so used to hearing them called GBRs that "Butterfly cichlid" didn't register with me.
See? I said he could ignore that part. :silly: