I would get that gold, or try to find a sanchezi. Within a year for sure youll be looking for a bigger tank no matter what you get. You could probably keep a rhom in there for a year or so too. They arent especially active when little and spend most of their time hiding. Just remove uneaten food within 15 minutes. wouldnt take long for rotting food to destroy the water quality in such a small tank, but my rhom who is 5-6 inches just lived 6 months in a 10 gallon while some renovations were being done and he is fine and kept growing thru the whole ordeal. He is back in a 55 now, but in a year or two will need a 90 at least.