ok for the ids first thing I would guess it is a copod cant be sure without pics
the second I would have to guess bristle worm again cant be sure without pics
and lastly kill the glass anemone they will kill any corals and several other things in the tank
easy way to kill glass nems is take a dosing seringe and a coffee cup full or water as hot as you can get it (without burning yourself) suck the near boiling water into the seringe and burn the glass nem it will literaly melt away
agreed that your little bugs are "pods" and a bristleworm.. these are "good guys" that means that your tanks is slowly starting to get established. your nitrobacter and nitrosomas should be being established as well.
in your cycles have you had your nitrite and nitrate peak yet? I would almost assume that you have since your 4 weeks into your cycle.