Should I thin this plant with pictures

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I think i figured out how to put pics up. This plant is prob 8 inches tall and i posted the grow log a day or two ago for it.

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I topped it for the first time in the first pic and the stem is prob a bit bigger than a 1/4 inche thick but i can't even see the stem unless i move leaves around. I am also wondering if the top leaves should be that big. i have another plant prob 2 inches smaller and not near as bushy.

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Here are some pictures of the other plant (Red Dragon). I bent the top off on this one because i seen a video that said bending the top off is FIM and it is easyer on the plant. Is this right?287693287694287695

Are the stems suppose to be purple like that? I notice both my plants start with green stems then they turn purple. Could it be to cold? I keep it between 72 to 73 at night and 73 to 77 day time.

[73kafer]

temps are not the cause of the purp its caused from a potassium def. which all purp strains have but only into late flower its nothing to worry bout its a good looking plant and you gotta think each leaf is like a solar panel you cut them off your going to shock the plant and lower its energy production which will just slow it down only time you should thin a plant out is when the leafs are dead or are shading other plants and also when they are in flower and you have poor air circulation