Curling Edges in 2,5 weeks old plant

Last month, I dumped 4 plants due to what I think were russet mites. I started treating them with wettable sulfur, and after 2 weeks, I decided to start over.

I cleaned up the grow tent with alcohol, cleaned the pots, submerged them in a chlorine solution, and made a new substrate. The temperature changes between 29 - 30 ºC during the day with lights on (240W quantum board – using ~250 ppfd in this stage) and 25 - 27ºC during the night with lights off. I'm in Brazil, and the summer has just ended. The humidity in the grow tent oscillates between 58 - 70%. Im watering every 2 days.

Now I have 5 plants, and they are only 1.5 to 2.5 weeks old, but I started noticing some curling edges. I sprayed them with Spinosad (270 mg pill diluted in 2.7 liters of water) 2 days ago.

I also noticed some tiny fast white bugs in all substrates (none of them on plants).

If something goes wrong, I'll only be able to start again in August. So, I ask you guys, since it's my third time planting, if I'm overreacting or something is actually wrong, and if so, what could I do to resolve it.

I also have, besides the Spinosad solution and wettable sulfur, neem oil.

thats just leaf matter catching up with its growing, nothing to worry about. keep an eye on her, just in case, but your good

don't know about the bugs

I know "buy more things" isn't always the answer, but predator mites (mites who kill mites) and other predatory bugs are a decent measure I've seen work.

go go kid said:

don't know about the bugs

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I can almost guarantee thats a predator mite. I have them in all my soil. They eat bad bugs. You can also tell by how fast they move. Most bad mites move slow. Predator mites, move fast.

Little on the warm side but other then heat you could have you lights to close for curling. Curing up is usually an avoidance move by plant trying to minimilaize surface area of photo bombardment or conserving moisture do to vpd outta whack and transpiration. Back you lights off should be minimal 24 inches away at this stage with a 240 hlg