well i couldnt see the wood sinking any time soon as it floated up fast. i tryed drilling holes in the parts u wont see but no joy ,and i brought the bogwood from the a5 aquatics with proper fish lables on saying bog wood etc .i put 1 stainless steel screw through the slate and up into the wood and its worked a treat so im gonna leave it for now.the screw and slate is under the gravel so not visable and i cant see there beeing much of a problem with one small screw. thanks alot for the coments guys and gals
I am currently having the same issue. Lovely bit of wood, but as its hollow, its naturally buoyant. Despite soaking etc etc etc, it still wouldnt sink. I got some steel from B and Q and tied that to it which made it sink (as the rock wouldnt work due to its shape). But true enough, after a week it rusted. I did an iron test and it was sky high!!
Your idea of screwing stone to it is a good one! I like it! I think i will try it! Just now there is more gardening wire keeping my bogwood down then there is bogwood!