My leafs are curling on the ends?

Hi Guys. First time grower, using Canna Coco and following the canna guide.

my leaves have started curling down on the ends and i dont know why. i am only doing 2 and they are in a 110x.65x160 tent with a 600 Hps, temp is apprx 27-28 degrees C, anybody have any ideas. i have been feeding every couple of days when ph/moist meter is ticking more towards dry than moist/wet.

Please see attached photos...

Any advice be much appreciated.

I vote too much water....need more roots. Don't know coco though so that's all i'll say.

Almost looks like the start of PH issue.
Like above I don't do Coco so its a guess sorry I can't be of more help.

papaoscartango said:

i vote too much water....need more roots. Don't know coco though so that's all i'll say.

Click to expand...

not sure.. Maybe ill wait another day or so until feed again... Thanks anyway

Well i use ph tester to check my water and i have bought premixed canna professional soil. Thank you, will bear this in mind...