It might already be fixed with the new fertilizer dosage regime given to me by Tom but here is some images of my bannana plant that is clearly deficient on some nutrient. Tank is 29 gallons. 50% waterchange weekly. These nutrients are added after the WC.
1/4 Teaspoon of KNO3
1/16 Teaspoon of K2HPO4
1/2 Teaspoon of CaCl2
1/8 Teaspoon of MgSO4
Seachem Flourish 3 mL every second day
CO2 Injection average of about 31 ppm during the photoperiod
Lighting: 20w 18000K Bulb, 20w 7600K Bulb, 20w 4200K Bulb
As you can see one of the older leaves has green veins and yellow tissue around the veins. The other older leaf is fine. The newer leaves are stunted and have brown edges. Sorry about the photo quality but these are the best that I have.
1/4 Teaspoon of KNO3
1/16 Teaspoon of K2HPO4
1/2 Teaspoon of CaCl2
1/8 Teaspoon of MgSO4
Seachem Flourish 3 mL every second day
CO2 Injection average of about 31 ppm during the photoperiod
Lighting: 20w 18000K Bulb, 20w 7600K Bulb, 20w 4200K Bulb
As you can see one of the older leaves has green veins and yellow tissue around the veins. The other older leaf is fine. The newer leaves are stunted and have brown edges. Sorry about the photo quality but these are the best that I have.