The tank is 60 gal. Running for ~8 years. The fish are Barbs, Tetras, Angelfish. The plants in the pictures are 4 weeks old. But it happens to all plants I've ever planted. Some of them loosing leaves, others getting yellow, brown and rotting away. Some stay alive, but in miserable shape, and the new leaves aren't growing. Basically I've never succeeded to keep my plants alive or at least doing well...