DSB. I have owned them all over the last 30 years and much prefer the 5-6" DSB using Southdown sugar sized sand.
My current 100G is 9 years old, the nitrates and phosphates are undetectable and the 6" DSB has never been vacuumed or cleaned ever. The secret is good circulation, minimal digging critters and leave it alone so the anaerobic and anoxic bacterias can do their job.
My current 100G is 9 years old, the nitrates and phosphates are undetectable and the 6" DSB has never been vacuumed or cleaned ever. The secret is good circulation, minimal digging critters and leave it alone so the anaerobic and anoxic bacterias can do their job.


