Home grown copepods, freshly bottled. Strained at 50 microns to include both baby and adult pods. Each bottle is topped off with freshly mixed, clean saltwater at 1.025sg. Pods will last up to 2 weeks, but it is recommended to use the entire bottle right away. What type of pods should you choose? Tigriopus sp. "Tigs" - These are the largest copepods available, and are actually a cold water species. They don't always reproduce in aquariums. Tisbe sp. - Smaller copepods, but super prolific in aquariums. Great for cleanup and cycling. Look for these at the bottom of the bottle or near the sand on the glass of your tank. Apocyclops panamensis - Another species of small copepods, very similar to Tisbe. Add some diversity to your copepod population! Look for these at the surface of the bottle or along the waterline in your tank. How much do you need? There's no way to overdose pods, and they will reproduce on their own in a healthy aquarium! Here is our recommendation for how many bottles you may need - For new tanks - One 16oz bottle of copepods per 20 gallons, as well as dosing a food source such as phytoplankton to prevent die-off. For existing tanks to replenish populations - One 16oz bottle per 40 gallons. Dose phytoplankton to keep populations stable! To culture your own - One 16oz bottle will be sufficient to start a 1 gallon culture. Select one species only to prevent competition in your cultures.