I have a new 20 gallon tank w/ 2 baby convicts and a baby janitor fish. all bottom dwellers. Can you pls recommend a fish i can add that would be swimming in the middle and in d surface so my tank wont look so empty and be a bit more colorful. Please recomend something thats not hard to find. Can i add a betta?
I wouldn't say they get along per se' , but they are pretty good at staying out of harms way. In a 20g though the lack of room will cause them to be in the cons face all the time which will cause issues . Really the 20g is too small for your cons , much less anything else. I would consider an upgrade sometime within the year, then start thinking about tankmates.