I haven't ever seen a problem with the hose going to the expansion tank, at either end. I also use the hose to see if there are any bubbles in it / moving bubbles as part of diagnostics as well. Replacing with a black hose would prevent that.
That being said...
When I install / service / reinstall a Aqua-Hydro Hot system, I have gone back in with a reinforced hose. It tends to pick up the color of the antifreeze, but can still see what is going on inside the hose.
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