I have a fully cycled 20 gallon tank. It has a background of vallisneria and then a full carpet of dwarf hair grass. For fish, I was thinking of getting neon tetras, honey gouramis, amano shrimp, and/or otocinclus. Would it work to have 15 neon tetras, 2 honey gouramis, 4 amano shrimp and 4...