white dwarf 1st grow. any hints or tips welcome

Hi
I have some white dwarf plants about 3 and a half weeks old. just wanted to get some feedback. Leaf stems on some plants turning red, is this normal? also would like feedback on size, colour and if anyone can see somethin im doin wrong. Growing in coco coir, ph 6.5 - 7. canna a+b. 200 watt red spectrum cfl. temp around 80 degrees. any advice much appreciated
 

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