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oh...and a few people have asked about the hole in the overhead shot.....its a 40mm pipe hidden in the rock, one of my sump returns will enter into here in 32mm (so it will just poke into the 40mm pipe - not a tight fit)
it sends my sump water to the bottom and flushes out behind this rock wall......with no danger of flood or syphon (if a 40mm snail blocked the pipe it would just overflow out of the top and down the front of the rocks.
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