first grow topp44/mandala mix HELP! please asap

i ordered seeds and got them in 8 days here in west coast us of a ,completely blew my mind.Not only paranoid they would get taken but would they get sent at all but i did recieve them in 8 days amazingly and stealth mode. well all top 44 beans sprouted and 8 of the mandala mix so far dissapointed at the freebees i got none have sprouted of the 20 chronic revenge 2"s i got any who i got some grodan pellets and i soaked in mild fox farm grow big nutes and i was going to flush with fresh nutes but my ph is in the mid 7:s any advice please help i need to transplant and im going to grow passive with airstones, i think thats what you call it wre you grow with a wick into water and also let the roots grow into the res water/nutes with an airstone. my concern is getting the ph down (how) much respect to all the peeps