Absolutely what they both said.
If there's no mud there, don't bother cutting.
The low end of the frequency range is what makes your mix rock, ony leave instruments down there that belong i.e. bass and drums, everything else cut if it infringes and cut bass/drums so they share that range.
It's suprising what low end frequencies synth pads can generate, almost always the mix benefits from a cut in this instance.