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How tight does the chain need to be? I've not really done much urban riding on a fixed gear, mostly on the track or round where I am there are no traffic lights, quiet roads and I barely ever have to stop to be honest.
I've always run a bit of track slack and not had any problems, is it a safety thing for when you have to slam the anchors on or something?
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Track slack are fine for track (obviously) but a bit risky on the road especially without a front brakes.
My way is for the chain to look straight, but lots of movement up and down.
Don't go too tight, it will accelerated wear and tear as well as binding the chainring, you can feel it when there's an obvious soft rihihihihihim feel from pedalling.
You don't need a chain tug (a tea towel or tennis ball is apt) but any cheap chain tug will do such as the DMR one.