Auto water changing line has turned brown

[Matt_Mc]

good afternoon
I setup my auto water changing system about two months ago. about a month ago the line supplying water to my display began to turn brown in color.

-I have circulating pump in the supply jug.
-I am changing over 15 gallons a week.
-I use Tropic Marine salt.

Should I be concerned wit’s this? Can you all tel me if this can cause any issues with my tank?

thanks for your help
Matt

 

[homer1475]

I would guess it's algae growing in the NSW line exposed to the light. One spot is all it takes for it to spread down the line.

Just my .02$

 

[Matt_Mc]

I was thnking the same thing but the return line is clear.

 

[homer1475]

Yeah one would think the "dirty" water should grow algae first.

 

[fish frinzy]

Replace with a black colored line it will not do that again.