I have 3 emerald green corys in my 20 gallon high tank... had 5 originally. 2 of them died, 1 of those 2 was a couple weeks ago and other was a long while back. Wanted to know if I can add smaller corys, like pandas with them and if so, how many? What other kind of smaller corys could I get besides pandas? I have 6 zebra danios and 1 dwarf honey gourami also.. If I shouldn't mix them, should I get 1 or 2 more like before?Thanks in advance for the help.