Clone growth extremely slow

Clones look healthy,have new growth,just not rooting/ taking a long time to grow, abnormally long, 400 watt hps,plenty of ventilation ,Co2 fed,an nute levels are good, help me fellow medicine makers help me

That is really vague my friend, pics? where did you get the clone? what kind of nute plan are you on? etc...

It sounds like you are talking about new cuttings. Some definitely take longer than others. I have some strains that take like 3 days to start rooting, and a strain that even can take up to 2-3 weeks. If they still look healthy it will probably root eventually, however I think any nutes except for something make specifically for rooting a cutting are not a good idea. 400 watt HPS is plenty of light, maybe too much, and CO2 is probably unnecessary at this point. That being said, ill take a dozen cuttings, and just stab em in some dirt, and sometimes 1 or 2 especially the really slow ones will just never take, but its not too common, and I've become really lazy with my cuttings. Like no more sterilized scalpel and stuff, just my trusty shears and an angled snip.

runnin extremely light to no nutes as of recently, got them on a pad, in an pod , plenty of humidty, once a day spray, pulled the Co2 and pulled my light way back(ina 78" enclosure)..got the cuttings from an accomplished grower, strong mother of og kush..will have pics later for sure...its just odd,verry healthy looking, and new growth, just the rate of growth is abnormally slow, like im at a 4-5 week slump, they started great an just stopped as it looks