The drip wall is also binned now - I'm keeping things simple in line with the weight of advice here. Besides, that frees up a £275 filter I can sell on.
I'm still looking at wall solutions for moss etc so I've picked up a sheet of Hygrolon which I'll be cutting to a 'chaotic' shape and pinning to the 3D wall I made (yes, it's not your regular 'mud wall' but I wanted something different). I had thought of those scrubbing pads but considered them perhaps too abrasive and might catch their legs? Maybe not if you seem to have had success with them.
Has anyone tried microfibre cloth
Here's a pic of progress up to yesterday. Basic horizontal landscaping done, now to work on the verticals.