Holding the tent at the same temperature day and night keeps seedlings alive, but a drop of five or six degrees in the dark period produces tighter internodes on indica plants and mimics what they get outdoors. Too big a swing invites condensation and mould, so aim for 25 by day and 19 at night. Temperature logs from a few members who tested different day night gaps on the same seeds, with photos of the node spacing, are shared on [url]https://kushindicaseeds.com[/url]. Cheap timers on a heater get you there.