When should I water Paphs.?

[Bmorepaph]

I recently potted some of my paphs in primeagra. How low below the holes should I let the resevoir recede before I water? It seems that on a few the PA has been wicking the water up very fast, and I have had to water every two days. I am pretty sure though this is because these particular paphs. are too close to my fan. I have moved them and expect that this should correct the problem. I am unclear as to whether I should let the resevoir completely deplete prior to watering, or if I should water rather liberally. I am really scared of rot!!!
Thanks.