I compared them today and both looked the same color to me.
Doesn't look like you got anything in your filter that will take out the nitrates. With the testkit (I have the same) it is hard telling when you are
I was afraid you would say that you wanted the others in pictures. Can only help with the white one and a really bad picture of the grey one with the
I have a sunsun HW-304b with UV and I have regular filter pads made for it and bio balls and marineland ceramic rings. I did have activated carbon but
No, changing water too often is not too bad. I am just questioning the accuracy of your tests. What exact canister do you have and what media is in it?