@eQuatics
just fyi - there are 3 models of RSM 130 tanks...
the original RSM 130 - 2006-2009 (no water level window on the left hand side, hood does not raise completely up, no surface skimmer cup, original skimmer without an adjustable neck)
this models skimmer ^ never worked well... thus the start of the "RS sponsor... StevieT's famous Media Rack & the founding of his company InTank" combined with a Tunze 9001 skimmer that many bought & ran as a replacement.
then the RSM 130D (deluxe ) in 2009 came out with a much improved skimmer, with consistent water levels, it actually skims as well as a 9001, some say better
RSM C130 - 2015
Your pics appear to show the original RSM 130 - all just fyi