Ok I'm looking into a used reef tank. It is a 60g has 75 pounds of LR and a 3 inch sand bed and comes with a wet/dry that has a UV sterilizer, Osonizer(?) and room for skimmers. I'm so excited! It also comes with a 175 watt metal halide and two fuval 303 filters. All for $150!
yep, sell off the halides, and get rid of that much sand...about an inch or so is fine (less chance of tank crash due to anaerobic decay)...what a deal though !!!
Can hardly wait to see some pics (hint)
Good luck. Just out of curiosity, how long have you been interested in octopuses? And have you studied their biology as well in the past or currently? But besides that, 60 Gallons is fine and make sure you get a number of other items such as a hydrometer for salinity, thermometer for temperature, a water test kit, and mabye an air pump for excessive surface agitation incase there isn't enough oxygen. Octopuses need a lot of oxygen and full strength sea water. What kind of water will you be using? Make sure you use R/O unit or RO/DI water to make sure you get the most pure water treatment as well as aquarium salt. There's many things to think about. And make sure you do more research on your way just incase.