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BB tanks are easier to keep detritus from building up in the display. I have a deep sand bed and it is pretty easy to maintain but DSBs scare people. They work on the principle of culturing anaerobic bacteria,(the ones that live in the absence of oxygen). Anaerobic bacteria can eliminate nitrates, however they must remain undisturbed so a DSB should be at least 4" deep. Some folks worry that old tank syndrome will happen with sulfurous material building up under the sand. I worked for a LFS and we put in many DSBs, some are 15 years old and working fine. My last tanks sand bed was 8 years old and when I tore it down the sand was just as fresh smelling as the ocean. In fact I reused it in my current tank hoping to reestablish a working DSB quicker. DSB are good for burrowing creatures but not the ones who will eat all the beneficial life in them. I have a pistol shrimp. Also I feel my rock work is safely anchored in it. Don't have to worry about a tumbling rock cracking the bottom. SSB are good if you want sandsifting gobies or sandsifting starfish. Some folks vacume them to keep detritus from building up in the sand.
About 1/4 inch all aroundHow far is it off level
Ya I can't wait lolWow, you will be aquascaping in no time!
lol ya they are pretty big lolNice. They don't look that heavy! LOL
Thank you it's a few pices put together I have to epoxy a few pices so it doesn't fall apart but it's huge I'll get more pics of it tomorrow. The other pice is a huge show pice too one solid pice I'll try to get some better pics of it too.Wow this is a stunning show piece of rock, very nice!!