In all honesty I think you might want to find a bigger tank check craigslist.com or local paper, because what you are wanting to do and what you have are not going to work. Believe me I am not judging I did the same thing when I got started had 3 dwarf gouramis, 4 cardinal tetras, algea eater, 2 red eye tetras, 2 red velvet sword tails, and 2 lyretail mollies in 20 gal. Yes I know I was a fish hater. I learned my lesson and now running 5 tanks all healthy. Start small you can always upgrade later when time and cash permit.

