#ed_op#DIV#ed_cl#ok im thinkin about startin a 55 gallon semi-reef tank ( a few fish and a few corals and about 75 pounds of live rock with a sand bottom) and what type of filtration is needed in order for it to be clean and healthy. and i am sorta new at this so it would really help if you explain as if im retarded and dont know anything. thanks for any help and have an awesome HaLlOwEeN#ed_op#/DIV#ed_cl#