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General anti-bacterial advice: Drop temperatures to upper 60's slowly drop pH to lower 6's with tannins from Indian Almond leaf or alder cone Mark's shrimp tanks H2O2 dose every few days Increase water change frequency + light gravel vac Natural anti-biotic advice: Look at the original post which mentions the oregano oil, which references a research paper. That has a recommended dosage of x micro-grams of caravacol per gram of shrimp food. Soak some shrimp food to the recommended dosage. Modern science advice: Nuke with anti-biotics

Ok. So update: Mixed 4.5mL of distilled water to one drop of oregano oil. Mixed well, and added (2 drops)to shrimp king(2) pellets. The problem is my shrimp never readily take to prepared foods.... so it’s a crap shoot. Temp lowered to 68f, this is as low as my thermometer goes. Dosing 15 Ml of H202 every three days. What antibiotic could I use, and can it be used inside the display tank? Thanks in advance for the help.

I’m not sure if you’ve read the thread, but: -Oregano oil killed/nuked my shrimp. It was horrible and I refuse to put it into my tank, in any form, again. -H2O2 dosing has already started per direct recommendation from Mark. -Water Changes are already increased -PH already sits in Low 6’s -All shrimp were given a stout salt bath I haven’t added any antibiotics, yet, as I’m not sure which one to try.

I assume you haven't had any more die? If that is thee case I would just leave it for now and just keep an eye on it, frustrating as you say, maybe when they next moult it may get back to normal? If you are feeling really brave you could try treating one or two with the shell marks as before (different dosage of coarse) but set up a separate hospital tank so you can only lose the couple you have in there anyway, rather than risk the others, especially the babies? I think I would just see how it goes as it is though for now, and let the colony grow and settle down, unless you see multiple deaths or more getting the shell discolouration! Simon