Hello! I recently got a 20 gallon high freshwater heated tank. (24 x 12 x 16) I am in the process of cycling it, so this would be for later, but I was wondering is a combination of 1 dwarf gourami, 6 white finned Rosy tetras, 4 Cory catfish and 1 snail be too much? If so, what would you recommend instead to keep it as close as possible? If not, how much more of what could I add?