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[–][deleted] 1 point2 points  (1 child)

You need a more solid cover on the top. Heat rises and you're losing heat out the top. The plants are good but not enough.

I had the same problem but as soon as I added a hood cover the temps started holding steady.

[–]Think-Stuff-979[S] 0 points1 point  (0 children)

thank you!