You have what looks like <10 slow growing plants in a 30 gallon, low plant mass, no CO2, with heavy feeding messy Goldfish.
Based on this thread https://www.plantedtank.net/forums/1...-pur-data.html
at 20" (if that is the height from your subtrate to the light) I would guesstimate you have low/medium PAR light.
was likely correct Fe and K are most likely what your plants need to avoid those yellow and brown areas, chasing fertilizer changes is not going to eliminate your algae problem. I would also keep your phosphates low <1ppm. It isn't helping with GSA and high phosphates will precipitate out the unchelated Iron you are adding and can cause Fe deficiency.
While balancing your fertlilizers better might help your plant health, you will only see that in new growth and with your slow growing plants and no co2 that may take a long time to observe, on the order weeks or months.
Really with messy goldfish you should be doing weekly 50% water changes, scrape the glass, vacuum all the plants and substrate, clean the filter and keep up on your maintenance diligently weekly. You will see improvements from that alone much quicker than changes in fertilizers.
Don't use dry ferts unless you get yourself a decent scale at least to two decimals otherwise you have no idea what you are putting in your tank.
If you want to slow down algae get more faster growing plants, you can plant them in the sand. Pick up something like some Amazon Swords and other low demand fast growing plants.