looks really cool with the MH's....i am sure you will make that a gorgous tank
but if you are looking for some more advice by posting the pics i would remove the dead coral sceleton...my oppionon is those are from back in the day when base and live rock weren't around (they sem to just grow nusence algea and don't look natural in ym oppinion)
good luck
is that a clam...it looks great i love clams!