I have used sand in planted tanks for many years and have never used anything to stir the sand. I leave the mulm to feed the plants and only remove it from the surface if it becomes excessive (which is very rarely)
Just awake and deciding if I should get out of bed. Went on for quite a while but no damage and not as violent as others of that magnitude. Located between Dunsandel and the Rakaia river.
Sounds like columnaris (also called saddleback and mouth fungus). It is a bacteria and needs to be treated with an antibiotic. Tri sulpha is often used but is a prescription only drug. The easiest to obtain is furan 2.
It is an available source of carbon instead of CO2, not a general fertilizer but it also has algacidal properties. Flourish comprehensive is the fertilizer.
It also causes silicosis but since fish don't have lungs it wont be a problem for them. Table salt also contains iodide but in such low concentrations as to be harmless. You can pay more for rock salt if you want but hardly worth the extra coin.
If I remember correctly, it contains meth blue, malachite green and acriflavine and any one of those or all together can be applied directly to finrot. The quinine is realy for parasites.