Tetras are good, but i would stay away from Neon as they are very sensitive and could die easily. If you like the blue and red stripe on Neons, there's a hardier species called Cardinal tetras. The cardinal tetra's appearance is similar to neon tetra, with which it is often confused; the neon's red coloration extends only about halfway to the nose . Black tetras or glowlight are pretty hardy too. I also would stick to 1 or 2 colony fish, looking at your tank size probably around 10 each species.
Clown loach is ok, they do eat snails
but they also grow big rather quick and tend to mess up your gravel searching for food, and you will see floating plants every now and then 
i prefer a couple of bristle nose fish to help reduce algae spots and siamese algae eater (SAE) fish will much on your green hair algae too. Shrimp is also a nice addition to the tanks as they keep the tank algae clean and help breaks down decaying matter. Some of my Darwin rednose shrimps pic below
there's a nice online shop http://www.aquagreen.com.au , if you're interested in native plants, fish and invertabrates. i can see you're in QLD, it should be fairly easy to get access to many species. I know a guy there that sells rare plants species.
