Thanks everybody!
Yes that is an internal filter, its inside the log, which also hides the heater inside. Very convenient!
As far as stocking I have a young angelfish about an inch and a half tall but growing fast, 2 kuhli loaches, a bulldog pleco, 3 adult guppies, and 7 young guppies about 2 1\2 months old, some of the bigger ones are just now starting to show their sex. My female betta shown in the photo is in my old 10 gallon now all by herself, but I've had her for about a year and a half. I figured by now she would be showing signs of old age but she keeps on going strong!