Will My Wood Sink

Looks great. 

Hi @Marcus_F

Sorry, I'm late in on this one. I would have been tempted to drill several narrow, but deep, holes into the underside or hidden parts of the wood. That would have helped water to penetrate more rapidly.

Just my two penn'orth.

JPC

Love the pictures of the tank, looks a neat set up. All I want to do is shout cut the string 

The wood wobbles a bit if I touch it, like it could still float.  If it does float I'd be helpless to stop it hence my worry.  I have two stones tied to it, maybe I'll cut the back one first

Thanks, fairly sure the moss stuff is attached to the wood, there is a lot of it now and there wasn't too much I attached.  I do need to cut back the moss, haven't done any real cutting yet.

Hmmm long scissors and a net or scissor it whilst I syphon out the water to try and catch it all.

This is definitely the best approach and what I would also recommend. The problem is that moss does not float unlike plant trimmings and so siphoning is necessary and doing it whilst you cut will prevent loosing bits of moss into the aquarium and it randomly appearing growing throughout the tank which you might not be able to get rid of again if it attaches good and well where it lands.

Whatever works for you.