terrarium growing with no fans, can this be done

[Discus]

nenella - what are your humidity readings like? Do you have max/min readings on it, or only ambient (if so, do you remember what the highest and lowest readings have been?).

I assume the terrarium is an exoterra model or something like that?

I bought a small reptile analogue humidity meter and it's utterly hopeless - doesn't even work properly. Perhaps it was part of a bad batch, but the needle hardly moves and the reading is nowhere near the readings on my digital temp/humidity sensor, nor on my humidistat-controlled ultrasonic mist-maker.