My tanks are bare bottom and it's MUCH easier to completely remove the feces...BUT, the feces is also much more noticeable. You don't have to remove solid waste every time a fish defecates (although, I suppose, this would be best for the water chemistry) but you shouldn't let it sit there for more than, say 2-3 days. Some people go bare bottom and then use a light spray of sand or gravel on the bottom, coupled with a few large rocks or pieces of wood to create a semi-natural effect. Unfortunately, there are no "high-tech" solutions to fecal contamination. It must be removed manually with a siphon.