That's not a good stocking
not to say your stocking is the greatest either
@ the op, the tank seems to have pretty odd dimensions. And in my opinion, the dimensions of the tank are much more important than the volume. the length width and height would be useful in determining what kind of fish you should go for. I'm thinking licorice gouramis, microrasboras, and endlers livebearers could all be choices though.
I'll also have to agree with rehoming the clown loach. While they are very beautiful, they are also a very large species of shoaling fish which originate in very fast moving water, and while they grow slower then molasses, they do grow, and are easily stunted and prone to ich. they are typically a very long lived fish, sometimes over 30 years old, but they don't last very long in smaller aquariums.