Rock wool for semi-H?

[Optimist]

I have a few large bulbophyums that I am thinking of doing semi hydroponic with a layer of lecca, and then a layer of rock wool. My older bulbo is in spagham moss, and has been wet the whole time I have had it. The bulbo is very happy in this, and it is the first time I have not "killed" a bulbo. Ray should design a flat mount type semi hydroponic tray. I found these plastic dog dishes. I have already drilled holes in them, but I think I will fill the holes with hot glue or something, and drill the new holes farther up the side. These are really nice and can be hung if you drill holes in them for a chain.