My white gravel is taking on a slightly yellow, almost burnt tinge.
I do weekly water changes, add water additive, wash the rocks in hot water vigorously and strain them with a spaghetti strainer etc before putting them back in, I wipe down the inside of the tank with hot water, all that stuff.
This is the first time they've done this but then again I've only had the tank and my fish for 3 weeks.
Is this just a normal thing? Of course it's impossible to get all the bacteria and naturally occurring organisms out, because we don't use soap. Is this natural and it's just easy to see on white gravel?
It's not all the rocks either, just a few here and there.
This is something I probably wouldn't have even noticed if I had gone with regular dark colored gravel.