Hi everyone,
May I ask for some advice on what fertilizer should i apply on this kind of setup. Please see the photo of my tank below.
I'm currently using Jbl ferropol liquid fertilizer which is not working on my repens.
So i'm thinking maybe i should consider different liquid fert. Here are some of my tank info.

Plants:
Staurogyne repens - old
Java moss - new
Anubias nana- new
Plant at the back ( don't know id)

Lighting: 2x 24watts t5 tube
Co2: 1 bubble/sec

Problem:
Old plant staurogyne repens leaf always melt. I don't know why.
Hope someone can help me with my problem. Thanks in advance.
image.jpg

Cheers!