These nutes ok?

I just wanna be sure these nutes are gonna be ok for my grow, I got some scotts rose and bloom thats 12 - 4 - 8 and I was gonna mix that with some Bloodmeal 12-0-0 to raise the nitrogen level. For flowering I have some Colorburst 15-30-15. These gonna be ok? And any ideas on how much to use?

SHould be fine.. I would always error on the side of going 1/3 to 1/5 the recommended dosage the first time you use nutrients..

cheers