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For those of you that are unsure of the differences, I thought the below might help shed some light on these products. Most Asian manufacturers do not disclose the composition of their products unlike the German manufacturers, so there is a lot of uncertainty out there as to exactly what one puts in ones tank once the packet is opened. Firstly a bit about aquatic bacteria: most aquatic bacteria are slow- growing. This means that biofilm is produced slowly. Biofilm is a gel-like mucoid substance secreted by bacteria that they live in. Biofilm in aquaria are almost always gel-like. Because aquatic bacteria is often slow growing, the shrimp outstrips the biofilm faster than it can regrow. There are biofilm promoter products and direct biofilm products and combinations thereof. Genchem Biozyme is a biofilm promoter: if you look at the ingredients, it does not contain bacteria at all. It is partially digested starch and cellulose and enzymes which are utilised by bacteria to form biofilm. Shrimp eat the Biozyme directly as well. It is basically a food source for your aquarium bacteria and is also fine enough for baby shrimp to eat directly. Mosura BT-9 appears to be a mixture of bacteria found in aquariums to supplement your contained ecosystem to prevent sludge, increase ammonia-Nitrite-Nitrogen conversion cycle and to outcompete pathogenic bacteria for food by established colonies that are present rather than growth speed. Because none of the ingredients are disclosed it is impossible to say what is in BT-9, but based on my experiments, it is the slower growing aquatic bacteria, but it does form a nice biofilm over time if you do not have large shrimp populations that strip it bare. I cannot comment on other ingredients in the product as it is not disclosed. Overdosing fouls the water. Queue the new generation products: someone asked the question wether it is possible to add an ‘artificial’ bacteria that grows fast enough not to be outstripped of biofilm faster than the shrimp can eat it? Pediococcus Acidilactici is a lactic acid bacteria that is temperature stable, grows well in pH 1 -6.2 ( grows a bit slower in high pH but still grows faster than natural aquarium bacteria) and is an ideal food source for shrimplets and the cell division rate of this bacteria is fast. It does not naturally occur in aquaria. Bacillus Subtilis is a bacteria found in nature from your intestines to plant leaves and outcompetes pathogenic fungus and bacteria for resources. It is very heavily used in agriculture like mango farming. It is not a direct food source for shrimp, but undoubtedly keeps your aquarium healthier based on controlled trials. Glasgarten Bacter AE contains both the Pediococcus Acidilactici and Bacillus Subtilis as well as amino acids, enzymes and vitamins to activate the bacteria. When used as directed, it grows lactic acid bacteria biofilm fast and greatly increases shrimplet survival as result as there is constantly biofilm available as a food source. Overdosing fouls the water. A similar product available is ShrimpyDaddy Revive Vita that definitely contains a lactobacillus. Genchem Polytase does not contain Lactobacillus, but does contain Bacillus Subtilis, so does Dr Tim's probiotic. Why is there a possible shrimp death warning on the Bacter AE container?: if you do not use an Oxydator in your aquarium and you add a large amount of Bacter AE to your tank, the bacteria will grow extremely fast and use up most of the oxygen in a poorly oxygenated tank, possibly leading to shrimp death. This will not happen if you follow instructions and aerate your aquarium well. This is only a risk if you add a very large amount of Bacter AE.