How long is too low?

[smy_749]

ok thats what I was lookin for. I'm not gonna do 4 inches substrate though because I don't want to constantly search for eggs when she starts digging. Just gonna do an inch , maybe 1.5 and a tupperwear with a thick layer of sand. Gonna grab a 3 foot x 1.5 foot rubbermaid, I think its the 72qt but its only 6 inches tall and throw a flexwatt on a thermostat.