Heat sress maybe?

First grow, doing my res changes right now as we speak. Need help moving forward

could be heat stress and it could be bugs or too much nutrients too early in my opinion. I think the best course of action would be monitor your temps, do a preventative bug spray(I like neem oil, insecticidal soap, horticultural oil) to rule out bugs and heat stress, and if it were me, I’d keep a closer eye on PH and probably try to feed that one less, but that might be tricky without under feeding the others. the only time I’ve personally seen deformities like that, I had broad mites and or russet mites. Rule out possible causes one by one and you’ll figure it out.

Type of light? Distance?
Temp / humidity?
Ph?

Like give us some info???
More the better...

1000w mh, 4x4x7 tent. They were about 30 inches away from light, i just moved them closer. Temps are pretty high, consistently around 90 and humidity is on the low side around 45. Ph is fluctuating, i aim to keep it at 5.8. Im using silica to battle the heat and using 1/4 strength nutes gh flora trio. Thisi s day16 from seed

Well you have a another post where your PH is crashing low which is shally a sign of root problems. Let’s see pics of the roots

Cover the pails!! Your just heating your water.