demonmagus
spamming my way to the top...
you could leave it empty and use it for carbon and stuff (when you need it) and the rest of the time it could just be a 'powerhead'. Do you know how many litres per hour it shifts?
there is one good thing about live sand (at least the caribsea agri-live). You don't have to wash it and you don't have to deal with all the crap coming out of new sand. Cause lets face it, you can never wash it enough to get it all out.
well there's lots of crabs in the sae . Could be a coral crab, gorilla crab, or some other. Are its rear legs furry or not?