Hi everyone! i'm planning to use my 54 litre tank to keep in a mediterranean cutttlefish (im from valencia, spain). ive kept shrimps in captivity, but ive never kept cephs. How should I take care of it? how can i feed it without being very expensive? i put gravel, should it be sand? is it enough with 54l? if not which other editerranean ceph do you reccomend?? pleaze help!!