Thanks guys!
I havnt measured him but i'd say he was about 5" - 6"
I just used the bag of sand that came with the tank...I too thought it looked quite natural so i stuck with it...I also scattered in some white rocky stones that i got from an aquarium...I have rocks from brighton beach (UK)...And a few i got from the top of Ben Nevis in Scotland (the highest mountain in Britain)
I've had no confirmation on what type of Rhom he is but i personally think hes a xingu