I completely agree with BillyZ. You need those test kits if you're going to make progress. The results will go a long way towards diagnosing your problems. Equiptment can be flexible, you're on the right track with a wet-dry and skimmer instead of a canister filter, we can talk about improving the system after we take care of the basics. You should be able to run a Fish Only tank with your current setup, we can think about upgrading to reef after we see stable water parameters, and healthy fish.
Hopefully you're rotating between all those foods instead of using them all at each feeding? Good job, variety is good for the fish.
Some people debate about the usefulness of brine shrimp as a food. I think it's fine in rotation with other foods. I personally like to have a bit of ice cream, or popcorn now and then, without regard to it's nutritional value.
Did you get the brine shrip eggs, the frozen cubes, the freze dried ones, or live? I'm sure we can get you directions.