Well just because you have good readings doesn't mean your in the clear. The red and green algea you speak of and weed like things (hair algea maybe) grow off of excessive nutrients in your tank. They are consuming the nitrates/phosphates in your tank and will keep growing until you reduce the amount of nutrients. Cyanobacteria may also be growing, its a red/purple slime that grows on anything when nutrients are low and flow is low.
The tiny worm like things sound like copeods or amphipods which are tiny little inverts that live in the rocks and sand. These along with bristle worms are beneficial life thats starting to grow in your tank.
You should never have to add salt directly to the display tank. Salt will not evaporate out of your tank so you should only have to add RO to keep your salinity right. Only time you need salt is when mixing water for a change.
Im sure there are people with very successful tanks that go no sump no skimmer. Lots of good quality live rock can provide enough beneficial bacteria to sustain a system. Thats why live rock is one of the best investments you can make in your aquarium. But since your just starting out its probably best to do as much research as possible and have all the tools neccessary before you try it with the bare minimum.
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