DTB, thanks for your full reply, it is appreciated. My point by point comments are:
1. I decided to go without anything in the base apart from some capillary matting to soak up moisture. I can always change this later.
2. I decided to go without any heat for the moment and rely on the ambient heat in the house which is keeping the tank between 16C and 23C (16F - 60F) and RH 65 - 90.
3. I am currently running one computer fan 24/7
4. I have loosely blocked up half of the mesh at the top of the tank to preserve humidity. The light hood covers the other half.
5. I have been using a hand spray bottle daily but have recently purchased something like
Ultrasonic Mist Maker Fogger, Shineus DC 24V Air Humidifier Water Fountain Pond with 2pcs Atomization Pieces Silver: Amazon.co.uk: Garden & Outdoors ... 2932622588
to add humidity which I do when the humidity drops a little. So far that is not often.
6. The 3 lights I am using are all exo terra 25W natural light bulbs but I will keep your suggestion in mind.
7. The light spread seems adequate at the moment.
8. At the moment I have none of my cool growing orchids in the tank nor do I expect to do so in future.
Thnks for the link to your setup.
Mike
---------- Post added at 11:34 AM ---------- Previous post was at 11:29 AM ----------
estacion seca, thanks for your reply, it is appreciated.
I do not have any of the "big" plants in the terrarium apart from the Dendochrilium Filiforme which is very much in its infancy at the moment.
I have three very small Tolumnia and have put the mounted one in the terrarium with the others in window although I hadn't realised they needed strong wind nor lots of water.
I will not be putting cool growers in the terrarium.
Mike