Impressive! Quick question about the sump though. When one of my mates dad was keeping discus he was using a sump and and one very impressive 70L 3 stage 'filter' tank full of various substrates to keep the water quality perfect for his fish. Now I'm guessing this what the smaller tank with the substrate in your sump is for. Would it be possible to use that set up for a freshwater tank so that it could be overstocked (not by much) and keep the water quality pristine??
Yes sumps can easily be used for FW and yes they alow you to over stock
a 10g tank with a 100g sump counts as 110g of water
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Nice marine tank, few pointers though.
1) More LR is needed in future.
2) Point the power heads directly at the LR from both directions, a strong current running through it is essential for filtration.