I use sump pump plastic hose for all my returns to my sump. 1.5" and slips over most all aftermarket overflows I have seen. A zip tie will 100% lock it into place too, plus its like $10 for a huge roll of it from any box store. Cut at the splices!
For the hose from the pump, it gets no simpler than a garden hose. Older the better, IMO, so as to not leach any plastic nasties into your tank. I have been usign these for YEARS without issue.