Europa,
That Tiger, if it is the purple one I think, is just a miltassia, miltonia, pansy, vs. brassia, hence the spikey petals... none of my plants are really that difficult, I had Odontoglossum Wyattianum (my personal favorite) if I could grow the odontoglossums, I would, but their temprement is not conducive for my growing... some day I'll get an entire wet bench apparatus and chiller to mimic their mountainous peruvian home ;-)
Your water seems amazingly pure, to me a gift nonetheless... I think apalacian water the notheast is a benefactor of our little mountains... the old mountains, hence high organics in the soil to break down the carbonate rocks... Is that statement correct chemically? To me our better quality water makes up for my uncle from colorado who makes fun of our "itty bitty" apalacian mountains. Though unfortunately I am on city water which is rather polluted with phosphates off the charts, and chlorine... haven't tested yet for chloramine, but assume the worst.
Europa, How do you get your humidity to 70%? I'm extremely interested in your balancing of humidity and air exchange/ medium composition. Like I try and keep humidity up, but probably never get more than 50% at best with all my air leaks. That's the reason I went to misting, to attempt to get some more humidity from my watering... Next time around I'll get a big pump and start with DI + nutes and small ethelyene tubing, and small misters, and only mist for 15 seconds, and use only isolite, not those gro-rocks... (sorry, I'm real tired, and that sums up my goals for my orchids)... Have you ever heard of Isolite? I got a sample one time, and the miltassia "Darth Vader" the purple one is in it and loves it... I find it better than the gro-rocks (fired clay) which seem to me VERY dry... like don't hold any water... anyways, the link is here:
http://65.108.148.58/isolite/index.htm
Keep me uptodate on your chamber! Ocelaris