Water Question! Oily look

phastroh

Do Not Listen To Me!!!
When I put top off water into my sump it looks at the impact area like oily.

I was like whaaaaaaat is that but it seems to appear wherever there is the fast movements of water. I used to think it was the oil from the water pumps haha.

Is this normal.

Also how can you keep air bubble from getting into the main tank when you top off and it causes bubble. I top off the last chamber of the sump and can't do the middle where the refugium is right.
 
Are you talking about when you look at the water from the side?
Fresh and salt water have different "weights". So they don't mix right away.
It's totally normal.
 
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