In my 20 Gallon Tank i have 4 Tiger Barbs, 3 Of the fish in the picture which i have derped out and cant remember what kind of Barb they are (Soon to be two), 4 white cloud minnows, 3 guppies (2 female, 1 male), and a Red Tailed Shark. I am almost convinced after the death of a few fish over the...