Newbie intro

[AmandaTom]

Hey all
I'm new to this site but have been growing orchids for several years with varying degrees of success. I was given a Dendrobium as a gift and when it actually reflowered I was floored--and the collecting began. I have about 30 plants and just ordered 5 more, though where I am going to put them I don't know....or how I am going to explain just why I need yet more of them.
I have a Stanhopea in spike for the first time and I'm very excited. One Catt is blooming and so are two Oncidiums. I have several mystery plants--can't recall what they are and they haven't bloomed to let me know, which is rather a Catch 22.
I use an overhead light in a greenhouse window for most of my plants. The glass shelf means plants above provide shade for those below. I have either humidity trays or saucers for all the orchids.
My least successful plants are the bulbophyllums which do virtually nothing. One had a growth spurt when I repotted it and the other has now decided it doesn't need any leaves at all, thank you.
I am still using tap water for the plants but as it is very hard I am thinking I should use something better. Should I use distilled water?
Looking forward to gaining wisdom, insight, and more blooms!
Amanda