i just ran out of bat guano and my plants leaves are starting to yellow so i was wondering if it would be ok to just use some miracle grow i had lying around?

__________________
"instead of a war on poverty they got a war on drugs so the police can bother me"

You can if you must. I would just start with 1/4 strenght. Also by using MG you will no longer have a 100% organic grow. I would get more guano ASAP to keep you grow 100%.

__________________
"Its all good if you open your heart and mind and allow it too be."

if you're strapped for cash, chem fertilizer is better than no fertilizer
i've not used it(or plan to), but urine could be used in a pinch(diluted urine)

i went with the mg, it will probably be the last time i even need veg nutes cause i started flowering them yesterday and i plan on transplanting them into sunshine mix with lots of worm castings and bat guano (i have tons of the flowering kind). And i go mostly organic lol, i use a little big bud in mid-late flowering as well.

__________________
"instead of a war on poverty they got a war on drugs so the police can bother me"