So you think he should change his substrate out?
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Im thinking since the tank will have to be emptied to move, I'd save about a 5 gallon buckets worth of sand at the very very most... Give the tank a really good inside cleaning while its broke down. Add about 80-85% new sand and just add a top layer of what he saved. ESP since he will be using the same filters & quite a bit of the tank water.. Why not give it a really good clean, best time to do it right is when it's empty.