i have a 75 thats been cycling for a while and im ready to add fish. im interested in octos and wondering if anyone can answer some questions for me. ive been researching them for forever but i figured id get some answers from people who actually keep them. i also have a 29 gallon reef/seahorse tank with about 5 seahorses and none have died for about a year now so i guess you can say im experienced. ive also been told that octos are easier to keep but im not to sure how true this is haha. i wanted to know first of all what type of octos can be put in a 75 tank? i relize the top has to be secured, but to what extent? can they lift up the glass with a weight on it? i would also like to know how active they are? would you be able to see them swimming around during the day? or are the mostly nocturnal. also how dangerous are they (not including the blue ring). is my hand in any danger when im cleaning the tank haha?