Purple/Brown air line tubing?

Hello :3 Currently in my Goldfishes tank there are two air stones in there. The top tubing (above the water line) look purple in color. Should I get new tubing? Should I replace it? It works, but I am just asking. Why is it purple? I looks kinda gross and kinda cool. The filter is gross, but that is what keeps my... show more Hello :3

Currently in my Goldfishes tank there are two air stones in there. The top tubing (above the water line) look purple in color. Should I get new tubing? Should I replace it? It works, but I am just asking.
Why is it purple? I looks kinda gross and kinda cool. The filter is gross, but that is what keeps my fish alive and not sick.

Has any one had this issue? Should I be concerned?

Thank you
Update: The tubing is a few moths old. I just wanted to add that just in case.
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