Ok, I've decided not to get a blue ringed octopus. I think I'm just going to start off with a bimac. This seems to be the most favored octo here. How fast to they grow? Is frozen shrimp a good staple diet for an adult? Of course I will suppliment this with live crayfish and crabs. I bought a trickle filter. Is this a good choice for a bimac? I also have a protein skimmer. Will I need an additional powerhead in the tank? I haven't identified all the life on my liverock of course but I know i need to get rid of the anemones, what else do i need to look out for?