Het Mark, if you're collecting moss for your tank keep in mind that there are many different species of moss, each requiring different conditions. If you want some moss to place on wood, find yourself moss that grows on wood. If you want moss to grow between stones, find moss that ... (you get it by now).
Also keep in mind that a tank usually has a higher level of humidity, so collect moss from a moist place. It's easier to add water, than to make your tank drier.
Alex, nice looking tank. I'm looking forward to your next project. By the way, did you glue that wood on a glass separation or how did you make that landarea?
Joeri