Hello littlemutt,
When all of your readings say zero then that usually means that the tank is cycled. The brown algae should just be a phase of the tank and it will not likely come back as long as you keep up with the regular maintenance. The green algae that grows on the glass will probably need weekly cleanings. Even the most established tanks will grow this green algae on the glass.
As for feeding the hermit crabs, I usually don't directly feed them. They will get any scraps that the fish might have missed.
The red and grey worms sound like bristleworms. Some people consider them as a nusciance but I feel that they are very effective scavengers. Usually if you see them eating something then it was probably already dead.
The grey armor plated creatures you mentioned are probably amphipods and are a sign of a healthy tank. These are very desirable critters to have. When you add fish to your tank you will probably see the amphipods more at night as many fish will eat these.
Since all of your levels read zero then you should be ready to begin adding fish and frags. Just take it slow and only add one or two things at a time. It is better to add any non aggressive fish first and let them settle in. If you add any territorial fish first then any passive fish you add later may get bullied.
Sound like you are off to a good start. Good luck and keep us updated!
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