My tanks (octo and bait) were set up last July. I always wanted to have an octopus and set up the tanks with that specifically in mind. After everything cycled I got my first octo in November. It presumably died at the end of December. I got a second at the beginning of March. It now has been missing since the end of April. I'm so sad. I now feel I should get something else (my manfriend wants a clownfish), but I'd rather find out why this is happening. Any advice anyone has is welcome. Here are my readings for both tanks this week. As I am a begginer with marine tanks I am still finding what levels of what I need to add to keep things at the place I want them. I'd love to say my levels are always steady with everyting, but they aren't. Calcium and I aren't friends. It goes up, I stop adding, it goes down, I can't keep it up. And lastly we don't really keep the heat or air on in our house and I'm wondering if a flux in temperature would be the issue. Thanks for any comments. BAIT 25 gal 76 F Temp (will vary up or down 3-4 degrees based on weather) 8.3 pH 0.5 Ammonia 0.1 Nitrite 5 Nitrate 350 Calcium 0 Copper 7 ppm Oxygen 1.024 Salinity 8 Alkalinity OCTO 50 gal 72 F Temp (will vary up or down 3-4 degrees based on weather) 8.3 pH 0.25 Ammonia 0 Nitrite 5 Nitrate 350 Calcium 0 Copper 8 ppm Oxygen 1.024 Salinity 9 Alkalinity Thanks again.