I have been doing AWC with my DOS for a while now. It happens periodically where I feel the need to replace the tubing from the NSW to the tank for the reason in the picture. The bottom of my reservoir looks similar. I know it is precipitation from water sitting there over the course a week (Red Sea Coral Pro, mixed according to directions, then sits in the reservoir without moving or heat).
Should I be worried/concerned with the way this tubing looks inside? Is it causing problems? Preventable? etc? Thanks
Should I be worried/concerned with the way this tubing looks inside? Is it causing problems? Preventable? etc? Thanks

Appreciate your help, as always!

