I wouldn't try to start seedlings in FFOF, it's too hot for seedlings IMO. Some growers do it and are successful but it's easier to start seedlings in a milder soil. You can veg with HPS if you have to but T5's alone are great for seedlings. With HID lighting, HPS lighting is best for flower, MH is better for veg. If it were me, I'd shit off the HPS, transplant and use a milder soil for a few weeks to get those seedlings back on track. Also, you only need a couple of ounces of water at this stage, no need for run-off yet.