Here's an image of a gammarus amphipod (actually, this is just a molt)
They are probably the largest "bug" or "pod" you see in your system. They, and mysid shrimp (opposum shrimp) are kind of big. You see them with the naked eye. They tend to stay in rock, sand and macro.
Here is a munnid isopod. They are probably the second largest you will see in your system. They rasp algae on glass, rock, and scuttle along macro too. They don't spend much time in the sand.
The smallest of the bugs that you'd probably see are the true calaniod copepods. They are easy to miss if you don't have good sight. They are on glass (look in corners of the tank with a flashlight) rock, macro etc. If they are on the glass, scooting, it's a copepod. If they are in a "swarm" or "School" spinning in the water column together, they are probably mysid hatchlings. I don't have a picture of a copepod in my system, so I took this one from a wikki.
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