Algae dying

• pH:
• Temp:
• KH:
• GH:
• NH4:
• NO2:
• NO3:
• PO4:
• Iron:
• Dosing: 10 mL Flourish, 25 mL Excel, 1 tsp epsom salts, 2 tsp CaCl2
• NO3:PO4 Cumulative Dosing Ratio:

Notes:
There's still some sign of what I think is a Magnesium deficiency: old leaves in the L. repens turn yellow and brown from the outermost end of the leaf to the part attached to the stem, and the A. reineckii turn transparent and melt away. It might be potassium, but then I would expect to see more black spots and pin holes? I added some Mg and Ca.

It's only been 3 days, but I can definitely see now that the staghorn algae is already turning red and dying all over the tank from the Excel overdose. Yay! And the green beard algae is receding, it also seems.

I haven't added any iron since the last water change, and many of the leaves are paler. But the R. indica is turning much pinker, and reds are coming out of some of the L. repens. Ordinarily, with lots of iron, these plants would be more yellow.