An nicely kill all the bacteria and start the cycle again....why oh why....
Ammonia based fishless cycling is a well documented process ... that would be the "why"
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And voicing my opinion
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I'm a great fan of fishless cycling, and pre-cycled filters on planted tanks are certainly not harmful & may be beneficial ... you (can) end up with a complex array of microflora/fauna established in your filter - and this allows you to add your algae crew at the outset of planting ... various shrimp, snails, otocinclus are far more efficient than human hands at algae consumption/control.
When moving, just drain the filter, rinse visible debris (not so likely in this instance) using "aquarium conditioner" treated tap water, reseal filter with a couple cm's of water in bottom (to maintain humidity) & this is good to go for a few days (or even weeks) - just be sure to open any shut off valves at destination as your filter crew does like air/oxygen
Of course if you leave the tank un-watered, you can play with hardscapes over the next month or establish moss on wood (re the macerated moss/water/beer/yogurt etc solution painted/rubbed on wood, then "dry-started") ... choose the option that most appeals
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(note you can also just add small amounts of fish food daily rather than ammonia - this will provide a more varied array of building blocks (C H O N S etc) to your filter microflora - and in some areas is rather easier to find than unmodulated ammonia - check the ingredients!)
Not all aquarium manufactured "soils" release significant amounts of ammonia