Dont know about muratic or citric acids. Distilled white or apple cider vinegar works well.
5-10 ml per 500 ml should do the trick. Sorta depends on whether the solution is going to sit for two months or two years. Two or three months probably doesnt need anything. Six months use a little bit, year or two use more, etc
Gluteraldehyde will do the same (Flourish Excel, Metricide, etc), but only if the container is light proof because it degrades over time exposed to light.
Only the micro or Fe solutions need it, not necessary for macros.
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