well i'm no expert ,i'm just telling ya that i topped at the 4th and have 4 tops,so if you wanan do that cool ,i don't know what topping at the 5th will do for ya .you know you can still cut it at any node you want,you can cut off half the plant and it'll be topped right there...and yes you can top as many times as you want man, it will always make the branch divide into 2