Iv made a huge packet of how to keep Octopuses in captivity the right way and much of the info has come from this site mostly, from a few other sites and off of marine books iv read. Iv been researching about Octopus biology since I was only 5, and interested since I was 3. But iv been studying captivity keeping now for over a year now. So iv made a packet not too long ago and it had an octopus story, biology about them and how to keep them and what to expect. I also include negative problems that may occur such as stress, boredom and certain changes in water chemistry. It has a full sheet full of water chemistry levels, and how to keep those levels as they are as well as a full list of equipment needed to keep an octopus and why. Just to keep it on the safe side, I want to know wether this water chemistry info is correct 100%...as well as the equipment list. _____________________________________________ Correct Water Chemistry Levels: pH: Between 7.9 - 8.2 Ammonia: 0.0 Nitrite: 0.0 Nitrate: 0.0 / Can tolerate levels BELOW 50ppmm Phosphate: Below 50ppmm Calcium: Anything not TOO low Oxygen: Keep as high as possible Copper: 0.0 To keep water parameters at right levels: pH: Use a pH buffer and regular water changes Ammonia: Active water filter and protien skimmer Nitrite: (same as above) Nitrate: Regular water changes Phosphate: Regular water changes and phosphate removal sponges Calcium: Regular water changes Oxygen: Air pumps and plenty of surface agitation Copper: Tank maturity, and pH should read above 8 __________________________________________________ The Octopus Equipment List: At least 50 Gal. Aquarium Tank Aquarium Hood RO/DI Water Aquarium Salt Hydrometer Live Sand Filtration Protien Skimmer Test Kits Heater Chiller Air Pump Lighting Thermometer ______________________________________________________ Other water parameters: Salinity: 1.023 - 1.026 Temperature: 60 - 79 degrees F. So is all this info correct? Please let me know if any changes must be made or any slight changes in case.