There is no guaranteed date. Density, drying and internal structure vary, even within the same wood type. Some pieces sink at once; others take longer or keep floating. This diary reports elapsed days and your observations, never a predicted deadline.

Wood can be less dense than water and can retain air. Soaking may change buoyancy. Test in a separate container without weights; a tied-down piece has not demonstrated independent sinking.

No. Sinking and brown water are different observations. Wood can sink while continuing to tint the water; clear water does not prove it will sink.

Fluval describes a common initial biofilm on new driftwood. Do not assume every growth is harmless. Investigate unusual odor, decay or distressed livestock, and check aquarium water conditions.

For Spider Wood and Manzanita, watch the branches and uneven floating. For Mopani and Malaysian wood, record the initial sinking state as well as water color. For hollow Cholla, note changes in trapped air. Choose Unknown if you cannot identify the wood; identity alone does not establish aquarium safety.

The start date is day 0. A certificate uses the first date recorded as naturally sunk without a weight. It certifies your observation, not a laboratory test. Editing that observation changes the result.

Export a JSON backup including photos, then restore it on the other device. Restore merges specimens by ID and asks before replacing a matching specimen. English and Korean share one local collection on this domain.