How Do They Look First grow so all tips are welsome

hello there these are my plants they all came from seed that i got all from the same hermi plant. They are 6 weeks old and are between 9 and 12 inches tall, they have between 6 and 8 nodes each. and seem healthy i put them into miracle grow soil ... im pretty sure it had lots of nuts cause everytime i try to give nutes they will start showing yellow tips any ideas? .. the nutes i am using are cann terra vega 3-1-3 wich seems like a low number too wich i dont quite understand ??? ... and they are being grown under a 400 watt hps and have been since seedlings, the light hangs about a foot and a half above the tips, the temp stays around 80-90 degrees celcius is that ok? also the humidity stays around 60-70. p.s. i just topped them last night they seem to be taking quite well since there are 2 new colas that have sprouted about a half inch. I will be posting new pics as they grow thank you very much and any input will be very appreciated.

hey looking good mate, i see you went with topping them thats good, now just wait for them to take off!!!

any updates?

hey thanks alot man here is an update now they are about 3 days in to flowering and the two new colas are all about 3 inches long i just switched to a 15-30-15 nutrient solution and it seems to be working awsome.. plus i think the one that i took close up pictures of is a male looks like there are little balls forming there ??/