i want to make a "cliff" on my tank like pictured in tis thread on the right hand side. i know you can take large rocks and put dait behind them to have mini rock facings. but how can you take cork bark and anchor it in like this the picture without it eventually coming those and falling over?
And whats the best subsrate to fill in behind it? i dont want to fill it with soil im going to buy cause that stuffs expensive!



P. sauvagei