I bought 3 vandas several weeks ago, 1 strap-leaf 2 mini semi-teretes. I have them in a south facing window in their original clay pots and only water once a week. I try to mist daily, but only remember 2 or 3 times. My trouble is that I can't tell whether they're dying or just poorly surviviing. The leaves near the bottom are yellowing...I've lost 4 on one alone. The minis are showing signs of new leaf growth at the tip, but I just noticed the top pair of leaves on one has a pattern on black spots. I'd like to check the roots but I can't seem to find any info on how they're supposed to look when they're healthy. Any help or direction would be appreciated.