Hi, Waffle777, I'm new here myself. This site is sweet, but you've got to check the dates on the posts..aside from your post yesterday, the last one in this thread was in February of 2010...a 40 gallon would be the bare-bones minimum for a bimac; the bigger the better. With regards to the cost weekly, it depends, as there are many variables. Do you live in proximity to a natural source, a supplier, or are you in the middle of nowhere needing all of its its food shipped every week? I'm in the same boat, in that I too am thinking about delving into octo-ownership. My plan for preparing is this: stage one, where I am now, is determining which species I'm best suited for. I'm also leaning towards a bimac, as they seem to be the best entry-level octopus from what I gather. Stage two is find a supplier, do the math with regards to estimated intake, round up, & bank that weekly cost EVERY week that my tank is cycling in preparation for its new "octo-pant". I'm doing this based on adult requirements so that I'll always be ahead of the game if a part fails or times get tough for whatever reason, sort of like a slush fund, as it were. Then, stage three is to bring the acquisition of tanks & equipment, followed by set-up & 3+ months of cycling. With that, everything, myself included, will be ready for the forth stage...a day off waiting for an overnighted package. Sorry I've been so wordy here, but you've given me the perfect opportunity to air my plan of attack, which I think is solid & well thought out. Please let me know your take, or if I'm missing something. Good luck to you, & hope to see you in more threads!