Ok been 3 mths now and i have done what i can with no solution, only been growing monte carlo in my nano tank sized abt 1ft lgth.
Co2 2bps with checker at green color on the opposite side
Light Pro LED Y series 25
Soil ADA aquasoil powder type
Filter shiruba xb305
Only rock and monte carlo

Daily water change for first week
Alternate day wc for 2nd week
Then third week sudden algae boom with hair algae
Got a team of amano shrimp and finally fix the problem in 1 week
Monte start to creep and grow nice but after a week turn brown on the edge of the leaves till the whole leaves. New leaves coming out just to turn brown again on the edge at the following week.

Start with potassium dosing for a week doing alter ate day dosing. No apparent changes.
But somehow, green dust algae boom all of the sudden, so bought some cae but doesnt seem to help. Do a large water change seem to tune it down. Still appear but in a controlled manner.
Monte still the same, growing fine but turn brown on the edge after few days.

Start dosing phoporus for 2 weeks now, still the same.

I am clueless as in how to fix this.

Additional info: i been using RO water since from the start till now.
Also, no water testing done. Not going to buy those testing kit which is so expensive. Or was it even necessary?

Hope to get some advise
Thank you