Hi Im bought an new tank over the weekend and it came withe an sand bed with sugar fine sand in. I also have an existing DSB with argonite and medium crushed coral. Now the big question is would it be better to use the sugar fine and seed from my existing system or just transfer the existing to the new sump? Also on this subject what value would the old under-gravel filter be in an sand bed would it be worth an try to make 2 section one with the under gravel filter and one without? Thanks In advance.