Im getting a 10 gallon tank, i cant aford a 20. I found some unique looking fish. they were called 24 karat mollys, they were a goldish yellow and were about an inch or so in length. Are they good fish?
They do better in brackish water, can get quite large and need quite a bit of swimming space. I would say no for your tank.
Khuli loaches would be good, as already mentiond. A group of 6, with caves in your tank would be good.