That's great looking wood. I like the vertical arrangement a lot too. We don't get much heather here in the US; does it sink well or is it one that takes a while to waterlog properly? Have you considered using some emersed growing vines to get the roots-dangling-in-water look? Pothos are supposed to be good for that and I think living roots would lend a realistic look to a biotope. As for the leaves, I've used all of those in aquaria in the past with no harm done. Looking forward to seeing progress of this one.
Just filled the tank just now. Got a bit of floaty wood which I'll need to bed back in in a day or two but not too serious since I've no plants being uprooted
I don't currently have a blackwatet setup sorry Tom. Must be someone else with same name I used to have a small blackwater with rummynose and gouramis, had pencilfish in a non-blackwater community but not now :/