you are going to want a fert that is higher in the p and k, with less nitrogen. Good idea staying organic with the seaweed. If you are looking to stay organic get your self some guano, its a great phos fert. You will see a change soon, dont worry, right now the plants are getting the idea that their light cycle is changing so its just a matter of time before it shows its sex and then if its a fem, buds. Im not too good with humidity, i was lucky enough to own a humidifier b4 i started growing. Well hope some of this helps, good growing man