Hydro top feed drip grow? Input please...

Alright this is my first time so here it goes. Ill give the specs and hopefully some pics later.

Strain: Cantelope Haze, clones
Weeks in: 3
Light: 1000 watt HPS, suspended 4 ft above babies at the moment
Temp: 80 F, definitely high (getting a fan today)
Humidity: ?
Substrate: Hydroton
Nutes: General hydroponics (using gro and flora micro, running 1/4 tsp per gallon as directed for clones/cutting
PH: maintained at 5.8-6.0, keeps on going up (more basic) everyday reasons?
Feeding schedule: 3 times a day for 30 min

Ok so heres the deal. I got 8 clones about 5 days ago. Brought them home and put them in their hydroton buckets. One of them is taking off (tons of leaf growth on the stalk. A few are doing alright not so much action on the stalk but mostly green. And a few are curling their leaves and turing yellow. Even on the ok clones there is some yellowing and curling of the edges and the tips.

Please answer these q's: Why is one taking off and the others lagging? What does the yellowing/curling mean? And if a clone has a completely dried up leaf can i just clip it off? Also, what does a drooping leaf mean?

These are an assortment of pics from the grow. One is of the good one and the rest are the ones of the babies in need. Is yellowing of leaves natural at this stage?

The yellowing leaves, if you notice, are the bottom leaves, or the old ones. They used up their nutrients to give life to the clone by helping to produce roots. You can also see the end of the leaves cut across by scissors, which is often done during to cloning process. You should carefully cut those off, as long as you can see new growth elsewhere. Those that are like that are lagging behind because they are trying to 'repair' those leaves rather than produce new growth.