Purple/Brown air line tubing?
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?