please help me its my frst time

i have some clones that are about 14 days old about 9 days into the grow the room got hot durning its dark time so i couldnt water by the time i got in it was dry and i watered them good to the wet on the meter and the next 2 days after one plant died and the rest have the top new leaves dead and the sprouts in between the lowerer leaver have died to they are starting to have a lil new grow should i let the soil completely dry or what should i do to recover from it??
 
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