the only benefit of keeping some old sand, it to reseed the newer sand you will add.
Keeping all or most of your old sand will introduce old dead food and fishy poo.
This will do more to cycle your tank then you want.(high ammonia spike)
Adding new sand with some old sand 1mm to 2mm will seed it, your live rock does most of your cycle regardless of a system with sand or no sand.
Sure sand helps, but after moving it, it does more harm then good.
You can super wash 90% of your old sand till your rinse water runs clean, but that's hours and hours of work even on the medium size tanks.
Anyone else have ideas to add regarding old live sand?
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