Thanks
@MichaelJ !!!
1. Size of tank: 182l (90x45x45 cm)
2. Age of the system approximately (3 months)
3. Tap water parameters (2dKH, 3dGH, pH 7.6, NO3 5mg/l, PO4 2.5mg/l, Ca 15 mg/l)
4. Filtration: Eheim Professionel 4+ 600 (foams, pumice, substrate pro)
5. Lighting and duration. (10.5 including 1.5h for sunrise and 1.5h for sunset)
6. Substrate (Tropica Aquarium Soil)
7. Co2 dosing or Non-dosing. (CO2 from fire extinguisher and DIY reactor, drop checker becomes yellowish)
8. Fertilizers used + Ratios. (at the moment per week: Tropica Premium 14ml, Seachem Nitrogen 20ml)
9. Water change regime and composition (Tap water 30% weekly)
10. Plant list (Rotala Green, Heteranthera Zosterifolia, Rotala Macrandra, Ludwigia Repens Rubin, Rotala H'ra Vietnam, Rotala Wallichii, AR mini, Pogostemon Heiferi, Hemianthus Cuba, Pogostemon Erectus, Bacopa Monieri, Rotala Bonzai, Cryptocoryne Parva Mini, Staurogyne Repens, Java Moss)
11. Inhabitants (11x Tetra Neon, 6x Otos, small population of shrimps. RC, Amano and Crystal Red.
The tank has been driven according to Tropica guidelines for first 90 days. Started fertilising in week 4th with Tropica Premium half dose (6ml per week). After 2nd month tried to increase dose to full recommended by Tropica introducing as well N and P from Tropica Specialised.
Over two weeks ago I had bacteria bloom caused probably due to overdosing of Seachem Stability. Then also I got to know about high levels of PO4 in my tap water. Returned to Tropica Premium as it doesn't contain P (and N as well) and introduced N from Seachem Nitrogen (20ml per week which raises N by about 2ppm). As per my calculation together with water change and dosing ferts I add:
Last week I tried to increase K to about 5ppm and Mg to about 0.9ppm, however I think it is too early to see any effect of this.