It seems like ages since I posted.
This weekend I had to strip this one down. It was growing ok but was suffering from that white fungus that grows on the wood, I'd been removing it for months in the hope it would sort itself out but it actually got worse and worse and in the end I got sick of it. I'm amazed at how quickly it grew and spread, if only my plants could do that!
Anyway, I'm taking a rest from the high-maintenance approach, I've replaced the wood with a few stones and I'm just having a bit of moss in there. I'll start a new thread when I've got a few pics.
Cheers
James