Is 29 gallons two small for O. mercatoris? Or could I even decrease the gallonage? From what I have read a wet/dry filter is reccomended for large octo species, but are these neccessary for the dwarf species? Would a good canister filter plus LR be enough filtration? How many inches of sand should I have for a dwarf octo? Would fiddler crabs be too large for an adult? How do you go about rasing the eggs? What equiptment and set-up should be provided?