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I did more research on Bifuran. It is Broadspectrum - which means it kills both Gram negative and Gram positive bacteria. API have a similar (same) product called Furan2. Their active ingredients are made up of two forms of Furans, hence the name. Furans are antibacteria manufactured artificially. Doing a search on API's version Furan2, which I presume is more popular, turns up many instances of "do not use with inverts". So the product is not safe for inverts or shrimps. <edit> - I'm going to write a new post on the following but I'll add it here first since it's relevant. Some common antibiotics used in aquariums: Erythromycin which treats gram positive bacteria and is best used in an alkaline environment (pH of 7 and up). Aminoglycosides marketed as Neomycin, Kanamycin and Streptomycin are active against gram negative bacteria and work well in alkaline water conditions. Sulfonamide known as sulfa or triple sulfa have antibacterial characteristics inhibiting the growth of bacteria. An alkaline environment is preferred and Sulfonamide as well as Aminoglycosides can be used in marine environments. Nitrofurans (Furane, Nitrofurazone) are also antibacterial but will loose their potency with increasing pH levels. They are therefore preferred freshwater treatments as is the tetracycline group. Tetracycline is bacteriostatic, inhibiting protein synthesis. This drug will get less effective in hard waters as it readily binds with calcium and magnesium. Quinolones, antibacterial to treat gram negative bacteria, prevents DNA synthesis and can be used in a broad pH spectrum. Bacterial diseases in fish can face antibiotic resistance, which means that the bacteria strain has mutated leaving it unaffected by the antibiotic. Another antibiotic will have to be used should this occur. Bacterial diseases are not contagious and infected fish should be treated separately in a well aerated hospital tank. Antibiotics are potent by themselves and never meant to be used in combination, as some of them can eliminate each other or create toxic effects for fish. Keep in mind that the beneficial bacteria are gram negative as well.

So after 18mths & a number of different graphic designers, I have finally got the cherry shrimp family tree ready for peer review. I know there is a few additions to be added, like blue gene orange rili & green orange rili, any other suggestions will be gladly added.

Thanks @OzShrimp I have enjoyed seeing the improvement over the years -it is worth culling out the lower grades even though initially I didn't bother. I'm cutting back on the number of tanks and varieties I'm keeping and the CRS are on the list of possible cut backs unfortunately. I'm not sure if I will keep the colony as I only want 4-5 tanks so will need to think carefully about what I'm keeping. My beloved hybrids will be staying though -they and my big TB colony won't be going anywhere for a while but the TB will be the absolute last to go if I cut back anymore,