Ive been in the hobby for about a year started with a 30 gallon nano and upgraded to a 70 gallon tank and 30 gallon sump.I have in my sump a protein skimmer,meadia reactor for nitrates,carbon pad,bio balls,filter sock.I just cleaned my tank yesterday cleaned up the sand and replaced 20 gallons of water.My nitrates are off the charts now i need help quickly.I have 2 powerheads in the tank right side is in the middle facing the middle.And the left powerhead is at the top middle facing a bit down.My tank has a big overflowbox return is i think 2"