Tank 93.5064931 US gallons. 48 in. x 18 in. x 25 in. AGA Fluorescent Strip 3" of fine sand? Filtration 140 lbs Fiji live rock 50 gal fuge with chaeto, skimmer, heater, various other cleaning crew & whatever live rock rubble comes out of four 35 lb bags Does all this stuff sound okay for an O. bimaculoides, or maybe O. vulgaris? A few questions about the vulgaris (if this tank is even big enough to keep one) - is it diurnal or nocturnal, and what temperature does it enjoy (the only # I read was from a ceph care article that said 25C) I live in NY so my biggest concern is the temperature not being cold enough for the octopus. The tank is going in my basement which generally remains between 60 and 80 degrees in the winter/summer. Is this something I should be very concerned about? Do I need to invest in a chiller, or should a fan be enough? Most Important Questions a. Can I definitely keep an O. bimaculoides in this? b. Do I have to be very concerned about the temperature? c. Should I use fine sand? And how many inches of it? Thanks for your replies!