This is microbe enzyme. I got it from a gentleman named Lim Heng Nai. He lives in Singapore and this enzyme has been used for 25 years on animals especially goldfish. It comes in powder form then you ferment it for 10 days. You spray it on the goldfish food then let it dry and feed to your fish. I have had some fish that since I had them have pooped white stringy poop. Within 2 days of feeding them the enzyme their poop is the color of the food and they are pooping a lot. The microbe enzyme purges the fish of parasites and bacteria. My fish who were not very active are now active and very healthy. It will boost the immune system of your fish and keep them from getting sick. I lost quite a few fish and the ones that were left were not looking very good until I started feeding the microbe enzyme to them. The female fish are releasing eggs like crazy. Their wen's are growing in nicely. The enzyme is not expensive. It comes in powder form and in that state will last indefinitely. You can contact Lim Heng Nai on Facebook and he will gladly help you and explain how the enzyme works. He has been raising goldfish for years and has a lot of experience. #goldfishunion #coastgemusa it's worth looking into. #eastcoastranchu another great thing is no matter how much they poop it doesn't change the numbers. This is the first time my nitrates have stayed steady at 5 ppm!!!