Hello! Recently got a 20 gal, it has 6 zebra danios right now and I’m wanting to put some African Dwarf Frogs in, and maybe something else. How many ADF’s is suitable for my tank? I know they are supposed to be kept in a group of at least three* (I’ve also heard two). I am thinking that would be possible for my tank but I want to be safe and get some more opinions. If I am able to have 2-3 ADF’s and still have room what do you recommend? Thx!!