Originally Posted by ZHiTcH41
With a sump, is the water changed performed there or still from the main tank?
Either one. Just turn off the return pump and siphon the water out.
Solo - just run a sump/fuge with a deep sandbed and macro algae. You'll see that many reefers here have success with just that. Its really not all that complicated. The DSB
and macro algae will suck up the nitrates. Then you keep your water params at the correct levels and voila, youll have almost the same conditions as an actual coral reef.