Hard Water Lines

[bry1105]

Ive got a 46 gallon bowfront freshwater aquarium with hard water lines at the water surface. How can I remove them without using strong chemicals that would hard my fish?

 

[neilanh]

Dry cleaning with DI water

 

[roka64]

Use a scraper. Is it glass?

 

[Dr_Doom2]

My mag-cleaner took care of the lines when I initially filled up my tank.

 

[jsoong]

Or use vinegar in an empty tank. Otherwise, a scrubbie & elbow grease for a glass tank.