Yellow leave's on cutings, week 2

Hi guys, very new to this so apologizes if this is already posted. I have recently set up a grow of 4 plants. I have a 600 w light, using soil and some alaskan fish ferterlizer (cant remember the actual 00-00-00 of the feed, the ph of the soil is 7 (neutral) Humidity is 60 to 65% temp is 70 to 75f currently on 18hrs light 6hrs dark. The problem i'm having is the leaves are turning yellow, evan newly sprouted leaves start turning yellow. Apart from that look healthy, should i be worried at all? Thanks for any advice in advance, much appreicated

Why did you add fish fertilizer?
I am not sure how close your lights are but sometimes especially when first adapting clones don't like too much intense light.

I would have stuck with a good known potting soil mix but for noce I would check your lighting.

I have done clones thats old leaves have gone yellowish but they just died off as the new growth appeared. Just don't cut those leaves off just yet or you may lose them. If the new growth is also turning yellow then I would guess it is your soil medium.

Hi, Thanks for getting back to me. The guy at the grow shop advised me to use it? Just 2ml per litre of water at this stage. The new leaves arn't turning yellow straight away. They seem pretty healthy the past couple of days, i'll post a more recent picture later. Maybe i'm just over analyzing them.