We think we have enough cleaner critters. Ordered an octopus today. Now onto octo proofing the lid, red filter for light, sourcing live food, and adding another den. We are going to try to have the octopus eat clams and hermits upon arrival. For a while. Our LFS seems confident they will help us get hermits for cheap. We are going to check bait shops too. I have seen links here for live food too. We found a fake rock that mimics a den. We want to put it on the back wall of the tank, up high, to give any critters a refuge or the octopus another den to hang in and see us but feel protected. We were thinking of using magnets or the plastic velcro stickers (like the ones that come with an ez pass). Is one option better than the other? We would like to make it removable for cleaning purposes. Should we put a mesh on the output flow tube?