When using all mineral media, its important that they sit in water, I think Joseph talks about that on his site.. They'll go dormant on you really quick if you dont keep the water level high enough(i've learned that the hard way lol).
I see this as an issue with mixes such as 1/1/1 turface/coarsesand/lavarock. And I believe I see this in a few of the pots that I recently switched to a mix that has Very Coarse sand (mesh 10 or so) in it. But I think that if perlite would be added to the mix water would rise up due to capillary action through perlite and turface and the pots could be allowed to dry for couple of days as suggested at
www.pinguicula.org.
In addition I'm hoping to try what was suggested here by Joseph:
http://icps.proboards.com/index.cgi?board=pinguicula&action=print&thread=4462
"
Presently I place a few pieces of LFS on the bottom of the pots (to help retain media), then I pack the pots with moist, iron oxide coated, perlite, to within 1/4" of the pot rims. Then I dust the perlite surface with RootShield® and a little dried insect powder. Then I cover the perlite surface with a layer of APS or "kitty litter", then spritz the topping with a 40ppm solution of peters 20-20-20 soluble fertilizer with trace elements. I then make a planting hole and insert the plant in its new home."
I don't think I mentioned it here but I do add iron oxide to all inorganic mixes to fight off chlorosis.
Basically, my recent switch to very coarse sand and absence of perlite could be an issue in some of these pots. Previously everything was grown in mesh#16 sand. Lava rock also does not help matters as it retains little water. So increasing the ratio of microporous minerals could be an answer to quickly drying media
Edit- Here is what I just noticed:
This is pure Turface Pro League which is made up of smaller particles than the one in MVP or in Pondcare Aquatic Planting Soil
Notice that the surface does not get wet completely. Turface is not good at capillary action.
Below is a little experiment that I just did with ink for better visibility. I am sure I am not discovering America here ofcourse, but it gives me a better idea on what mixes to make in the future:
Turface MVP on the left perlite on the right
Ink moves in into perlite via capilary action and turface is just getting wet on the bottom (same thing happens when I use water)
One more drop of ink added in the middle: