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You don’t need to strip the tank at all. The mold/fungus is growing on either uneaten food or a very dirty substrate. Just clean the gravel and don’t feed too much, and the totally harmless mold will go.
Do you use a gravel cleaner at all? What are the tank’s water parameters?
 

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Use a gravel cleaner. Push it down vertically through the gravel right down to the bottom. It will remove the muck. Then plunge it down again next to that part. You should be able to clean it fully this way with two or three water changes. No disturbance required. Then you can leave it and just use that method occasionally to keep it clean.
No bacteria on the gravel will be lost. :)
 
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