Originally Posted by azmodan
I would up your cory and tetra count to 6+ each as they are social fish that do better in larger groups. The clown loaches you may want to look to rehome as they get much too big for a 20g. You could do a dwarf or honey gourami as a nice centerpiece fish, or also a German blue or Bolivian ram.
I would definitely agree about the clown loaches. They are way to big of a fish for that size tank pretty as they are. German blues are sooo pretty I am thinking about another tank just so I can add some!