I have a 20G that my brother gave me. I moved some of his fish around in my tanks and what not. Right now I have 2 giant danios with 3 red wag Platy. 1 of the 3 platys are adults 2 are fry. What else can I add?? I'm leaning it to be a planted tank. Also has ivory snail in it with moneywort. For lighting I have T8 lighting.