remove the non organic decorations, clean with bleach, soap, and water, and then leave it to soak in clean water after just to make sure you got the chemicals of. for the organic decorations and the tank, I would borrow from the aquarium trade and use a potassium permanganate dip. It's an aggressive cleaner, kind of like peroxide, but it's harmless once rinsed off (and dark purple/brown so you'll know if any is left). it turns brown from purple if there is any sign if bacteria or other microorganisms in whatever you use to clean it. use it like you would bleach for the tank, and as a 30 second dip for any plants or wood. throw out the substrate and get new stuff.

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