yellow water issue

Hi! just cleaned my HOB Seachem Tidal filter today. Added new sponge but reused of course my Seachem Matrix. I haven't run carbon before but thought it wouldn't hurt so I added a bag of Fluval activated carbon media. My water was crystal clear before and now it's turning more and more yellow...

Hello, I have had my tabk up and running for 3 weeks now, two days from now I have started to see the water turn yellow. Since 5th day I have had a little back of activated carbon sitting next to my return pump but no luck with that. I had an old canister filter cleaned and bleached several...