BBA on old glossostigma leaves

[shriraj]

hello guys,

i m getting BBA on my old glossostigma leaves new leaves are healthy and keeps on growing no issues on growth of the plant. can you guys tell me is there any deficiency. because all other plants are healthy and there is no BBA on other plants.

Pictures

 

[WyldFya]

There is definitely an imbalance. Have you tested your levels? How much co2 are you putting into the tank??

 

[shriraj]

no i have not checked the co2 levels but i m putting 1bubble per/sec

 

[WyldFya]

I meant have you checked your nutrient levels. NPK

 

[shriraj]

no i have not checked the npk levels

 

[lipadj46]

how do you fertilize, what is your light level, size of tank etc...

 

[shriraj]

Tank dimensions are 30(in)x12(in)x18(in).
Fertilizer :
MONDAY WEDNESDAY FRIDAY.
150gms kno3 in 1000ml .46X5ML=2.30ppm for 1 dose 3x week
20gms kh2po4 in 1000ml 0.11x5ML=.55ppm for 1 dose 3x week
4gms k2so4 after water change dry dose(sunday).
TUESDAY THURSDAY SATURDAY
MICROS 5ML
Lights:2x36 watt pll(6500), 1x14watt t5.

 

[lipadj46]

my bet would be not enough CO2, turn up the CO2 slowly. Even in the best tanks you are going to get some algae on old leaves though.

 

[WyldFya]

I would highly recommend testing your phosphate levels. Also, what kind of filtration are you running, and how much surface agitation do you have?

 

[shriraj]

i m using an internal filter. how to increase the co2 levels and how to checl for co2 levels.