Just google "It's the blinds, stupid". Then click on the second link that appears.
This theme is recurrent and I think message #1 is: you *really* don't need a positive red line to be profitable. At all. In fact, you will often *need* a negative red line to extract value from calling stations - they never fold, but you do.
On a side note, after playing (learning and getting beat at) 6max, if I play full ring NL4 I have a positive red line. Especially at Party Poker. Why? Everyone is so nitty in some tables my blind steal stat is 100%. Often in one orbit I steal from SB, BTN and CO with any two cards. And they fold, fold, fold. If they call, I cbet (almost) any flop and they fold - even better for my red line.
Another thing that helps is going after the dead money - especially limpers. Punish them for limping. If they are bad, they will either fold (better) or call and you can take the pot later or, if you hit, valuetown. If they are not so bad players, they are 90% of time limping low pocket pairs. That means they will call your isoraise, but will hit only 1 time out of 9 so you can mostly take the pot down with a cbet. On limped pots when I'm the blind, depending on the villain (and if it is only one, of course) I always fire a potsize bet with any two cards and any board. Reason? They are probably playing a pocket pair that way and will not hit often, so they fold if they don't hit a set. Again, to do it you have to separate horrible players who limp any2 and will never fold anyway, and not do bad players who setmine like hell and will just fold every time they don't hit a set. If this last type calls or raises you, you now you're beat and you're done with the hand, but much more often then not they don't hit.
Then again, doing that relentlessly will put you into funky spots all the time postflop. If you are the kind that if play J8o and hit a J on the flop can't lay down your hand, then that play is not for you 
It's all about the table. If they fold too much, go after the dead money (you'll have a positive red line). But the most common in micro limits is people who never fold. Then you will have to fold more, and extract a lot of value when you do hit - and this will give you a slightly negative red line (you'll give up small pots) and a huge blue line (you'll extract lots of value from stations when you hit).
If you search the forums this discussion is recurrent. Topics like 3betting in position, re-steals, etc., you can find there and on the post I pointed to at the beginning of this.
And by what I could say, if you play micros and your red line is break even or slight decline, that is excellent. What counts is the green line, focus on that and on big leaks before tweaking the small ones.
That's my 2c 
