Algea or nutrient deficiency

[fono555]

Hi, I'm wondering if the black on my staurogyne is algea or a nutrient deficiency.

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[igirisujin]

Looks like algae to me. You have it on the rock, too, perhaps? The newer leaves look clean, so it seems to be affecting the older leaves only right now.

Can you tell us more about your setup? Particularly tank size, light, CO2, dosing.

 

[fono555]

Yes its affecting older leave only. Not seem the same on the rocks, but maybe it's just me.

Here is the spec of the tank:

• Age of the tank: 3 months
• Amoniac and Nitrite at zéro
• Tank: 17 gallons
• Filters: Ehiem 2215 (Seachem Matrix, eheim susbstrate pro and purigen) and Eheim 350 surface skimmer
• Substrat: ADA Amazonia + power sand
• Light: Chihiros 601 Serie A plus 7 h/day
• Co2: Injected Co2 2.5 to 3 bubbles per seconds, open 4 h before light open and close 1 h before light close (The room if very bright)
• GH 100-120 ppm (dGH 5-6) and KH 40-50 ppm (dKH 2)
• Water change 50 % per week with tap water (my tap water GH 80 ppm and KH 50 ppm)
• Fertilizer: Dry fertilizer (kno3, kh2pso4, k2so4, CSM+B) and Seachem Nitrogen + Seachem Flourish. Dosing 7 days a week and a mininum of:
  • Nitrate equivalent: 25 ppm per week.
  • Phosphate: 7 ppm + per week.
  • Potassium: 25 ppm + per week
  • Iron: 1 ppm + per week
• Fully planted: Pogostemon, alternantera, staurogyn, Bacopa bonsai, hemianthus, ect;
• Living: 10 danio galaxy, 15 amano shrimp and 2 otocinclus