now done another bit of the rear wall.....and rigged up a light bulb over my cheato crate in the sump (that's boring so pics of the rock only!)
Started by cable tieing the rock to the egg crate:
Then added the foam:
and more....
At this point I was about to start the sand covering when i realised the sand was in the boot of my wife's car and she was out! So in a moment of boredom i put the rock in the kids paddling pool to see what it weighed under water.......and it floated like a bloody balloon!
So mad hacking away of all spare foam and even some chunks of egg crate - PITA but made it much more open which i like.
Coated all exposed rock in epoxy resin and buried under a mix of sand and coral gravel:
Need to wait 24hrs before the surplus coral gravel can be brushed off and any bits i missed touched up, but you get the idea (there's a LOT of loose gravel still on there to brush off)
Gives an idea how open it is now...
I like the open structure more - only change it will require is i will scrape if the dark blue backing on the tank where the rock wall is and paint it black.....so any spot where you can see through the rock work will have a black background