Help: planted tank needs a 'lift'

[nuart]

Hi, I have started a planted tank abt 3 months ago. It used to be very lush (dark green) now the stem plants are slightly more yellow, the glosso at the bottom seem to have more dead leaves / roots. Japanese hair grass seems to not spread as fast. Algae used to be bad, now turn down the lights, this has improved. But the hair algae on plants seems to be trapping more dirt. While nothing seems terribly wrong, it is not great either. To keep algae down I keep 5 ottos, 7 yamato and 1 golden algae eater. It's a 4 x 1.5 x 1.5 tank

Recent recent started with plant dose, altho has not been regular. Any ideas?

[Shadow]

Need more detail such as what is your light wattage? filter flow? substrate? fert dosing? CO2 injection?