Swimfins
This is as good as it gets.
Watch your amonia, nitrites for sure. You might think of moving your filter and fish to a 20g tank. If you can, move the filter and your substrate to the 20g. This would be the best solution. Your tank is way too small. If you can't, find someone to take a fish or 3 off your hands. You will definately run into trouble sooner or later. There isn't much else to be done.