hai everyone

today after work nothing to do at home itch fringer test my water parameter and this is the result

gh 180ppm 10 dkh
kh 40ppm 2.2dkh
ph 6.5
no2 0
no3 40ppm


fauna
terta 50+
crs 20
cherry shrimp countless
otto 10
snail(forgot the name) 4

plant
hc around big as a keybroad
moss spike ,flame
hairgrass
ricca

fert
mirco and macro 3time per week

base
custom soil
gravel base

tank
4x2x2

lighting\co2
MH 2x150 2xt5\54watts moonlight led
co2 5bps

my question how can i lower down my gh
and brown alge on the back glass hard to scrub after 3day i scrub brown agle will come again??

how do i settled this problem??