[banditpowdercoat]

Can you do frequent water changes on the Old tank to eliminate waste buildup?

And the Sand, I've heard/read that it's better to take a whole section of sand out, not skim a layer off all the sand. So, take 1/3 of the sand, or whatever your wanting, but where you take it from, take all the sand all the way down to the bottom. That way you'll be not disturbing the remaining sand and releasing alot of bad crap. Will most likely get a little cycle in old tank, but not nothing major.

Also, can you put sump under new tank, but keep it plumbed to Old tank after placement, or is it the re plumbing that will take the week? Shouldnt need the sump hooked to new tank for cycle. Just have new tank running with powerheads for a while. No Bioload, shouldnt need a sump.