What Nutrient Deficiency Causes This?
Hi I am quite new to aquascaping. Had lots and lots of different kind of algae blooms and had to cut back on the fertilizer to stop the algae from taking over the tank. Thankfully with many water changes and barely no fertilizers algae bloom is now taken care of. I believe algae bloom was caused by EI method which was just way too much fertilizing. Some of my rotala plants were stunted from growth due to the toxicity of the water. Now all my plants are growing.
few days ago I noticed that the leaves of my plants had some large holes. One of my Anubia plant had a hole, and then from the center it became yellow and now the whole leaf is dying. I know that this is happening because there are some nutrient that the plant needs, but I don't know what it is. Instead of overdosing, I want to dose the nutrients that are not available in water (I guess you can call it a more specialized fertilization plan for my tank). I have attached the photo. Also this is my setup:
65 gallon tank
Light - 128 watt t8 bulbs
Pressurized CO2 - 18 to 30 ppm (4 dKh with 6.8 or 6.6 ph level)
Nitrate - always above 5 ppm
I do not have water testing for Potassium nor Phosphate or any micro nutrients.