Moss going brown

[Soulstar]

Hi guys, so recently my moss started turning brown. Tank details as per below.

160L
T5 x 36w x 4 (giesmann+arcadia) 10 hours per day
3bps co2
Supplement with flourish line (iron+potassium+trace+phosphorous+nitrogen+excel)
8 fish + 6 amano shrimps

I'm thinking it has to do with some kind of nutrient deficiency, what do you guys think?

 

[Rivercats]

Mosses are pretty easy to grow for the most part and with having good lighting and CO2 most likely it is a nutrient deficiency. Do you know your nitrate and phosphate levels? I don't know how much of each fert you use but I would suggest upping your dosing to see if it helps. Good levels for nitrate in a planted tank are 10-20ppm and 1-3ppm phosphates. Do you know your ph, kh, and gh levels?

 

[Coursair]

Also how warm is the tank ?
Some mosses like it a bit cooler I've read.