Hey Dude,
Not trying to be a jerky or anything, but I really hope your not putting sharks in that 55 gallon tank. your making a big mistake if you are. i find it strange how you initially talk about a mysterious 180 gallon tank. Then the entire thread changes to the real tank a 55 gal. Now, just because you had a 10 gallon fw tank does not mean u r ready for salt. trust me. I did my research before diving into SW and i still had major miscalcs. dude, just learn first(because it looks like you need to) then become a hobbyist.