I am new to fish keeping and I absolutely love it!! My two gallon tank has slowly upgraded to a 37 gallon tank and I could use some advice about what kind of animals to add to it. Currently I have a Betta, three Mini Red Serpae Tetras, and another fish that I believe is of the Cichlid family but I'm not sure exactly. I would like to add some kind of bottom dweller maybe like a cherry shrimp, or dwarf crayfish? As well as some more fish but I have no idea what kinds to get?