Hey everyone - Just found out my female Lesueur's is gravid

these'll be the first geckos i've bred - so a couple things. those of you who've bred velvets - what did you provide as a lay-box? I was thinking a small container with damp sphagnum...? Also, incubation temps in the high 20s ok? Any idea of incubation time? Cheers!
-Sam
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I bought a packet of Snakes Alive yesterday.
Opened it up, and they were all dead