48h and dead?

if i've done the math correctly, 84.5CFM = 144m³/h, right? the tent is only 0.192m³ i thought it would be enough

Your temps are still going to be too high bro, that fan just isn't going to cut it

Even with the mh?
Another thing, in my county, the temperatures are never lower than 55ºF (day) during winter(right now (00:20h) it's 60.8ºF/16ºC outside), it's hard to manage the temperature
I'll try to get an ac, but don't know how soon can i get it :\

get a ac asap.. turn off some light and just keep a little on to keep them alive

I agree the temps are hurting the babies but isnt 10" above seedlings a bit close even for a 250? These are seedlings and theres not much veggitation to absorb light so how much can they really use at this point?

the light is now 20" away. Opened the tent, got a fan blowing in, the temps are down to 82.4, and the plant seems to stand on it's own
Still, it's only 8:40AM here and the outside temperature is sure to go up

Good job getting the temps down. Razor's right, you do need a bigger fan/ blower. Better to have one that will move more air than required. I have my garden in a 122 csqft tent with one 600w and a 465cfm blower pulling hot air out 24/7. No air cooled hood or anything, just the cool negative air pressure coming in. Over the summer temps rose and at one point the temp in the room where I keep my tent was 85 but the air inside the tent was sitting right at 79. Trick is to have a BIG fan and a somewhat sealed tent to help create the negative air pressure to help keep temps cool. You know you have good negative air pressure when the tent walls get sucked in. I've tried leaving the tent open before and it actually ran hotter than when closed up due to the loss of negative air pressure.

Try to get a bigger fan or add another to the one you already have. Not sure what kind of tent you have but I know alot of them you can fit two fans in them.

I can't really afford a propper blower right now, it'll have to wait. This is my tent.[\url]
Anyway, the plant just died, already started germinating another seed. Thank you all for your help.

be careful when getting a gd exctraction fan, mine sucks the grow tent inwards if i turn off my incoming fan lol had to cut 3 6" holes in tent and have an incoming to stop the suction thing going on. if u grwin in room it might suck the air out before the plant has a chance to gt the gdness ie suffocate her! gd 2 see they picked up m8, its agd thing if u can keep ya dr open wit a fan helps but be careful for security. gd luck wit next seedlings u will gt there and itll b worth it. nothing like smoking ya own