So to sum up what I need is something that can attach to the bottom of the tap and connect to a hose. I've seen rubber ones bot I don't think the rubber is aquarium safe.
I could also replace the tap altogether with a something to a ribbed hose connection (excuse my poor plumbing lingo)
something like this
https://www.homedepot.ca/en/home/p.p...000123290.html
But I don't want to loose the tap for easy shut off.