20g Aleady Overstocked Or Some Room For Cory?

[jinni1980]

Hi. I have a 20g long tank. 2 platys & 3 black widows & 1 black molly are already there.
All of them are kind of crazy swimming ones, i wish i could have few small cory in there.
I want them but i really don't want 2 stress my fishes just because of i can go & buy..
Is my tank already overstocked or just enough or maybe have room for cory???

 

[SombreroBanana]

Well, black widows need to be in at least groups of 6. So you should up those numbers, but you still probably have enough room for 6 of a smaller cory species like pandas.