seedlings and ph?

how early do seedling develop ph preferance? im using a organic starter mix and when moist ph is 4-5.5 now thats ok for germination because my soil is 80 deg. and lots of moisture in the propagation dome but when repoted and under h.i.d (metal halide) hoe soon should soil be adjusted to proper ph?

Just let your water sit out uncapped for 48 hours. That way all the chemicals will disapate. Will work.