Paphy, I agree not too crazy on how they look... but I'm also not into how big they are, probably can't put them nicely in a small aquarium or glass vessel... however I'm willing to try them and will eventually order just because how they work, if they work for me, would be crucial to grow certain things if at all for me with the summer heat up here... as wintergirl pointed out.
There is an interesting use of terra cotta pipes that I believe work in the same way for nano vivariums. In them a terra cotta pipe sits permanently in water at bottom of a cylinder and through capillary action stays evenly moist, and you grow micro-mini's along the surface. In kool logs they work by keeping it filled with water on reservoir... below is a link of examples by this swedish guy who is an amazing grower of many minis and apparently a brilliant tech guy by way of tech for miniature vivarium growing
https://www.flickr.com/photos/lika_s...7606521712474/
as you can see the terra cotta gets engulfed with moss and plants, so I'm hoping that once I try a couple the same would happen with the kool logs...
wintergirl, how often do you have to refill the resevoir on typical summer week?