Lay off the caffeine, don't worry. First, ich is a bacterial infection, it's so small you wouldn't be able to see it in the tank, so what you're seeing is definitely not ich.
Dollars to doughnuts the hitchhikers came on your latest batch of live rock. Without a more detailed description, it's hard to say what they are.
Take a magnifying glass and get a closer look. If you look carefully, you'll probably see them on the front of your tank, water returns, power heads etc. Note how many legs, whether the front ends have claws or elongated legs, if the bodies are segmented or not, whether there are antennae etc. The more descriptive you are, the better people can help you.
The best thing is that you have a copepod break out which is a great thing. Copes are the beginning of the food chain for most carniverous fish and a sign of a healthy tank. The worst is that they are mantis shrimp larvae which would suck worse than a sequel to the movie "Dude Where's My Car?".
By the way, how are you treating the ich and how long are you going to treat for? It's persistent so be careful.
