Cultural differences - green vs. mottled leaf Paphs.

[Ross]

As long as the leaves are bright green (not dark) then light probably isn't the issue. I'd up the amount of feed. Also, do you use artificial lighting to supplement? If so, get it closer to the plants. If not, then consider it. The leaves on mine are really light green, like really... Mine get dappled sunlight (what's sun?) when it shines. In between times, the plants get what they can from multiple CF bulbs.