first lil hydro project - wouldbe mother with a lil curling on the leafs

hi all,

glad i found this site, and that it continues to avade those that would rather have it shut down!

i started my lil hydro project a couple of months ago, kitted out the back bedroom completely sealed, light proofed with air intake/outtake and a side room about 3' x 3.5' x 8' (d,w,h) which is for the mother(s) and at the mo seedlings/cuttings

i've only got one survivor of the original 8 super skunk seeds (from sensi seeds) due to a few cock-ups along the way but she (i hope it's a she anyway) is looking pretty healthy. however most of the leafs are slightly curled up at the edges and slightly dark in areas. (see pics)

anyhow, i check the ph daily and have to keep lowering it coz it keeps on rising, so i try and maintain a ph of around 6. i'm using a hydro grow nutrient at about 1/4 strength now and it's in what's called an aquafarm. but basically it's in clay pebbles with a constant supply of water/nutrient that is pumped up from the main tank.

the light is a 4-tube brightwing - fluorescent, 220 whatts producing 19,200 lumens and is posistioned about 55cm from the top of the 26cm plant.

temps stay around 75 - 80 f with a humidity of around 40% on average.

errm what else might help?

Links:
Aquafarm
4-Tube Brightwing

Pics: (not sure you'll be able to see the slight curling up on the leaf edges?)


​

 

nice one smokinjoe, i did have the light about 20cm from the top of the plant but wasn't sure if that contributed to the curling of the leafs so raised it again. it does generate some heat but as to how much i couldn't say.

i was told that if you can feel the heat when your hand is just above the plant top it's to close?
​

 

thanks, i didn't have any idea of how long to keep the water pumping and as it was constantly flowing over the roots, thought it would be ok. i'll stick it on a timer.

this is a closeup of the leaves as well...