Watering Phals and Dendrobiums?

[OrchidLife]

Hi - I'm new and I'm an orchid addict!

I killed my first phal from over watering the tightly packed moss it came in. I now have three phals and a phal type dendrobium. Since I murdered my first orchid *sob* I'm obsessed about over watering. I have the pahls potted in a bark/charcoal/perlite mix in plastic pots with bamboo skewers and I feel relatively confident that I am watering them ok. It's the dendrobium that I'm concerned about. It is one of the phal types that spikes from the top of the cane. Does it like to be on the same schedule as the phals? Wetter? Drier? I repotted it in my bark mix when I got it home as it was drenched in soggy moss but it didn't seem to take to the bark. I couldn't get it to stand with tipping over so yesterday I repotted it back into moss. Despite my messing about with it the roots look good and it seems healthy. The bottom leaf on the tall, flowering cane is turning yellow but I think that is normal - right? I hope I can get lots of advice here as I'm completely addicted to buying more orchids and I don't want to kill anymore!!!