I had all the same struggles hiding my floating air lines. I have a small pond aerator with ¼” black air tubes. I wanted a solution that wouldn’t need to be reconfigured or built from scratch when I change locations of the air stones from time to time. Ultimately I used a 25’ black coiled telephone handset cord. Super easy!-Just slipped the line down the middle. Also, I was able to wind it around the white air regulator piece so it can’t be seen either. Small bonus, I think it is adds layer of protection for the hose. Hopes this information helps someone who is being driven crazy by their floating airlines.