Seedlings turning light green, yellow then brown, plz help, pix attached

[Clossc]

298235

[Shovelhandle]

transplant them into party cups cut drain holes in the bottom, buy good soil mixture like Dr. Earth or Fox Farms Happy Frog Potting Soil. Keep them between 72ºF and 84ºF. Fluorescent Daylight lamps. Don't overwater!