Update on my oscar and tinfoils I couldn't resist and I'm selling my 20 for 60$ and I've lined up a purchase of a 55 gallon for 60$ full set up so I'm gonna give these guys a better home! Also got a jack Dempsey. Will have the 55 up and running Saturday.
congrats on the new tank. The oscars and tinfoils will outgrow that tank as well with time. If you want to keep the oscar in the smallest tank possible, Id say go for a 90 gallon minimum or a 75 with LOTS of filtration. He gets big and beefy and is a messy eater. You will need the space.