what i've noticed at these low buy in heads up, is that people get frustrated fast, they want to finish you as soon as posible, so as only_bridge sayd, they get frustrated whithin 5 mins, so have patience if you have an oponent thats really loose, if he is tight you have to bet like at least 80% of the pots, and dont forget the c bets.
also very important, the fish usually, at this level, likes to bet very small when bluffing
, like 80 in a 400 pot, and on turn he bets 80 again, usualy a sign of a fish, and when he has a monster, he bets pot or even over bets the pot. i played 6 today on fulltilt, won 5 lol. but the rake is killing me.