I'm setting back up my reefer 350 and I just remembered that the return hose that comes with it is sorta long and starts to bend. Is it safe to cut it ?
I would think so. You may want to get a hose cutter (weird looking scissors) so you get a square cut and fits the fixture again. Also, that hosing is easy to replace.
That will be fine to cut. I might replace it with braided hose though as I find the red sea hose is prone to collapsing on itself or kinking when its longer.