And lets assume for the moment that i don't need to hear about how i shouldn't have fish in the tank while its cycling.
Opened yourself up for that oone eh? He he,,,I won't throw stones, I started with damsels in the beginning.. It is safer for the fish to do it fishless, and I recommend it now, but hey, to each his own right?
I would not use a skimmer until you see the Nitrite and Ammonia go away for good. As soon as you see that, you can use a skimmer IMO
.. Now, it will also depend on how you are going to stock and feed your tank...this will decide really whether or not you are going to have to have a skimmer or not..