Why Are My Leaves Turning Yellow?

[darksage]

I've heard Anubias can yellow if they're not getting enough CO2. Even with Excel, it might not be enough. Have you considered a CO2 system? It's a bit of an investment, but it could help.

[Stormy11]

Man, I had the same issue last year. Turned out my tank was too clean. Weird, right? I started feeding a bit more, and the plants perked up. Maybe your tank's just too sterile for the Anubias to thrive.

That's a wild take, but it makes sense. Plants need some nutrients from fish waste. OP, how stocked is your tank?

[daisylea]

If you're not ready for CO2, you could try increasing your Excel dose slightly instead of cutting back. It's a balancing act, but some plants respond better to more carbon. Just keep an eye on them for signs of melting.