soil looks pretty dry in the pic dude if you check you water for ph you are looking for between 5.8-6.8 if using tap water i boil it first then leave it out for 48 hours to rid of chlorine but you shouldnt need to flush em if your not giving nutes which you dont need to untill about 5 weeks what light you using?
sorry dude how old is it it doesnt look sexually mature to me what strain is it and how far from the light isw it