So I was in cali last week. checked out this LFS. The owner had a very interesting saltwater system set up.
The DT would drain into a sump/tank, with the return being at the bottom, under the sand bed. WAter isnt going up/down through baffles, and No skimmer, just everything gets pushed through the 3-4" sand/gravel bed. all this fish seems very healthy. He's said he's been running this style set up for 30 years with very little loss. I did not see any dead fish in any of his systems.
He uses this for his coral systems too. No skimmer anywhere.
Anyone done this before? Potential issues?