You might need to cut the lower half of some of the leaves on the clones, this forces the clones to root in an attempt to get nutrients instead of drawing them out of the leaves
i use a t5 as well.. like 15 inches away, dome them and spray with water first 3 days.. then 4th day let them sit in fresh air... (dome if they wilt hard) but try to lay off the dome after day 3-4
never put water in the tray... just add a little to the top of the cube.... keep under that dome humid ..... Dont keep that T5 too close, they just don't need it until you see roots popping out the sides.