Switch your lights to even out the temps... it's colder at night, so have your lights OFF during the warmest part of the day (11AM-6PM or so).
Or put in a heater.
Even if it doesn't kill them, cold wet soil amplifies nutrient problems and stunts growth.
stinkyattic Reviewed by stinkyattic on . is 15c night temp 2cold for seedlings? hey guys.. well i had heat probs slightly.. now its getting really cold.. my day timew room temp is like 25c.. n just above my 10-11 day old seedlings temps bout 28-29c.. with fans nice and cool.. well lights are on 18/6 from 5am-11pm.. so dark times from11pm till 5am.. i checked the temp at bout 12am lastnight temp was 15c.. and 1 baby has turned slightly purple round the edges of the baby leaves... will my babys be ok at that cold temp 15c for 6hours every night?? if not would closing my Rating: 5