Pleurothallis racemiflora
I have some in all four of my tanks. Blooming on one now...
Perspective is skewed and it isn't the best photo. Each flower is about 1cm natural spread.
Not a tiny plant, but it seems to fit well in my 15-20G tanks. Spike is about 18" high and touching the top glass.
Grows pretty well pretty much anywhere, forming huge specimen plants in the greenhouse.
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Rob's Rules:
http://littlefrogfarm.com
1) There is always room for one more orchid
2) There is always room for two more orchids
2a) See rule 1
3) When one has insufficient credit to purchase more orchids, obtain more credit