diesel ryder doesnt seem to be growing as much as it should

may bit an obvious answer but the nutes came with a pre made box (yes im lazy/shit at diy) its green/blue coloured crystal like solid nutes veg and flower which mixes in water could that affect it? ph 5.5-6.5, ec currently 1.6 but within a day shoots to 1.8 and so on to easy. they are approx 10" tall (except 1 tiny plant) and bulbs are 20w each 2x flower and 1x veg age 5 weeks.
on left was 7 days ago not much change..if its because the nutes are complete shite any recomendations? so much empty space dying to be used up

Are theses CFLs ?

No joe dirt they r super halide magnesium grow tubes.....
now to the answer... It could have something to do with UR nutes but u gotta remember its prolly only gonna get 2 ft on a good day great day u got a 3 ftr but ya tweak UR conditions and keep em in check and next grow u will get bigger plants... It could be a number of reasons like stunted or overwatering anything keep up the progress bro goodluck

Sorry i wasnt clear they are cfls The veg are 24w 1500 lumens 6500k and flower is 2700k 20w 1152 lumens.
The jiffy pellets often get wet through does that matter with dwc hydro as roots obv submerged?

Lol it's pretty obvious they r cfl's

hey man they are actually doing fine they will swell up alot more.. just about anything with low rider is realy small then they blow up at the end usually last two weeks sometimes last 3... tried lowrider #2 and doing a pakistan ryder now..

Need more light maybe cause light = bigger plants