Do I need a fan to blow under the leds?

One thing i forgot to add, i had one phenotype that was prone to foxtailing. Quality was still fantastic but it lead to some weird looking top colas.

Pics to show what i mean.

one of the normal pheno and one of the foxtail pheno.

Weird leaves too so must be same genes though no foxtails yet.

Cool and wet weather setting in, I really hope not to see bud rot outside.