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Depends on how nasty the water is when you take the sand out. Your biological filtration is all your sand and rock. So transferring to 100% new water, as long as the parameters are matched is not a recipe for disaster. But if you can pull out 25/30% to transfer, to help with adjusting the differences between the new/old water it could make the transition a little less traumatic on your inhabitants.
Dave B
I have moved many tanks and fish over the years. The key is stability during the transition. No drastic changes in water params.
If you are worried about using your old sand in the new tank. I recommend filling some panty hose with the old sand and leaving that on the new sandbed for a couple of weeks. Then you can remove the old sand without leaving it in the new tank.
Make sure you have everything laid out and ready to go. Lots of buckets and towels. Also make sure you have some extra Novaqua/Amquel - You might get some ammonia spike from stirring up everything. And Amquel can handle that. And Novaqua helps with fish slime coats, which can be affected with transfer and change. Both will make your skimmer overflow, but both are good to keep on hand.
Dave B
No worries about the questions, that's what the forum is for.
The rocks (and corals) will have collected detritus on the underside and low flow areas. Fill the buckets with fresh water and rinse everything off.
Also you probably have your aquascaping with larger rocks on the bottom. With the buckets you can move your top smaller rocks, and corals into the buckets to get to the bottom rocks which need to go into the new tank first, but come out of the old tank last.
Depending on your fish, once your start pulling the rocks the old tank is going to get dirty awfully quickly. So moving the fish to a bucket of clear water (from the old tank before being distrubed) can make it easier on your fish.
Don't forget lots of towels![]()
Dave B

