Ok so I was on here months ago trying to decide what I wanted to convert my new 75G tank into and I eventually made it a reef tank (coming along very well, no problems at all yet). At the time I also had a 150 Preditor tank and a 29G species tank for a peacock mantis shrimp. Two weeks ago my mantis died (had him for a little over a year) while trying to molt, I noticed he was stressed out so I regularly dosed the tank with iodine that he needed to help him along, it just stretched his life a little longer. Anyways I have completely emptied the tank out, and am in the process of getting it started back up and started thinking about a smaller octo to put in the tank once I revamped it a little. It is a 29G biocube with PC bulbs on it. I am thinking about taking the top off completely and putting screen over the top so there is a nice airflow yet still being proofed so the octo cannot escape. I have read the other two threads that were recently started about a 29G tank and no one asked the questions that I had :P . I already know how and where I will get my food supply. I have a 150 preditor tank with some very very messy eaters so i'm confident I can handle a large bioload. So I guess my question is, without taking the bioload into consideration would it be possible to keep a hummelincki (sp?) in a 29 with minimal LR (already have a plan for a nice rock setup). If not then is there anything that is likely to be active during the day atleast somewhat, this tank will be close to the front door and people will see it often, would be great to actually show them something when they look lol. I appreciate any comments/concerns anyone has. P.S. This tank is already on hand and I saly cannot upgrade it because I am running out of room since I already have a 150 and 75g tank around the house.