DWC CURVED TIPS OF LEAVES ? PH IS 5.3 WHATS GOING O

I have 3 cones in one 5 gallon DWC TOPFEED that the roots finally dropped and growth in one really took off! Leaves and plant swollen 3 times the size in a week but it looks like theres some curving in the leaves and maybe a little deformed at new growth im running 30-10-10 Mendocino and im just curious why the weird curled tips? I dont have a PPM METER so what should i do and i have the feit optimal tent light setup so i know lightning isnt the problem maybe a little heat maybe ... My other 2 cones in the dwc one is slowly behind the big one and the 3rd is struggling roots just came out when was put in the dwc and is mainly why im still top feeding.

Pics?

Just uploaded roots are beautiful have dropped almost a foot in a week

Temps? No nothing about clones tbh. Your ph is 5.3?

Temp in tent is 78 average water temp i dont know. And what did tou mean about the clonez

I mean ive never dealt with clones. If using a feit which is led i think? You could be pushing low 80s and your plants would probably love you for it. Your temps in res should be 65-69 and any higher you could end up with probs. You say the roots are white so that may not be an issue. Ph should be in the 5.5 - 6.2 range. Id let it grow a bit and go from there

Definitely wait for more opinions tho! Someone else could def give you a bit better advice.