Pesky leak

[E39LV]

So I've had this coolant leak on my 13 e70 LCI but really slow. It finally developed more now where I could identify where it was coming from. I believe it's the bottom hose on the expansion tank.
Question: when I look down there from topside the clamp is on and it looks completely normal. What would cause a hose to leak all of the sudden like that??! I've had the vehicle a year and a half and haven't done anything coolant system related. One day about a month ago the low coolant warning came on and I replaced the couple capfuls that were missing upon inspection. Now it's a little more noticeable.
Do I replace the hose or cut an inch or so off the end depending on how much of the tip is cracked? Or is it the whole hose that has failed?


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