Using a 48x48x80 tent in my basement. Humidity is ...

I generally have the opposite problem. But any good small room humidifier should work in your sized tent. My tent is only 2x2 foot. A small aromatherapy atomiser works for me even. The plants especially rely on humidity for some of their moisture in the first few weeks as roots develop. 30% might impact early development. I suspect it is going to matter less as the plants mature from now on. Might even make it easier to control mould and other pests. Maybe put a clear cover over the seedlings next time. A plastic container with a few holes can increase humidity easily. I definitely recommend foliar feeding early on as well. ILGM have an easy grow schedule for their WW with indicative temps humidity and TDS.