So I recently got a 55 gallon tank as an upgrade from my current 37gal. Im splitting up my 37 gal between a 20gal and the 55 gal (two different houses). So my question is, what is a good non-agressive fish that doesn't mind being alone or in small groups? Will they do well with these other fish 1f molly, 1m molly, 1 black skirt tetra, 1m swordtail? I'm planning on getting a few more guppies and a couple more swordtails in the 55 gal along w possibly a cory-cat or some other algae eaters. I am happy with all suggestions! I am very open and willing to spend a little extra money to bring some beauty to my tank! I was thinking about getting 2 fancy goldfish butI don't know if they'll do well with these fish's water preferences! Also possibly interested in getting some females betta's as focal fish! Any suggestions?