The symptoms of the Rotala do not match with any one deficiency. This means it is almost certainly a toxicity. Macro fertilizers don't usually cause issues, but micro fertilizers do and the symptoms are similar looking to what you see in the Rotala.
This is a 7.3g tank, with ADA Amazonia,
By adding 1/4 tsp of each of those fertilizers in your 7.3g tank each week you are adding: 28.85 ppm NO3, 35.36 ppm PO4
, 58.73 ppm K and 2.54 ppm iron
. The recommended dose is 0.1 ppm iron so you added 25x more iron than is recommended, and roughly 35x more phosphate than is recommended (1 ppm is the normal).
When I dosed about 1.5-1.7 ppm (DTPA chelated iron) iron I saw signs of toxicity in my plants. This is backed up by several research papers which found 1.1 ppm iron is toxic (non-chelated iron). Furthermore, there are other more toxic metal nutrients in CSM+B that were also added at 25x the recommended doses. Some of the micros like copper are toxic at 0.15 ppm and should be dosed at less than 0.015 ppm.
Basically, you need to stop dosing CSM+B and phosphate entirely and let the plants recover. For that matter why are you dosing the water column with fertilizers anyway? You are using aquasoil which should have all the nutrients in it. You only need to dose the water column if you have plants that are not rooted in the aquasoil, and even then dose sparingly.
If you still really want to dose the water column then I recommend you first wait 3-4 weeks and let your plants recover then start dosing but use the fertilator on APC to calculate how much of each you need to add, it shows you the recommended amounts at the bottom of the calculator box. You'll also need to buy a digital jeweler's scale from ebay (about $15-17), it should be accurate to 0.01 grams since you are dosing a tiny tank. Otherwise you can buy the 0.1 gram scale and then mix a larger amount of fertilizer with some water and do a dilution until it is diluted to the correct amount (ex: if you add 1 gram to 1 cup of water, then take half of the water out and put it into a new cup, then add fresh water until you fill the cup you'll have 0.5 grams in the cup, keep doing that until you get down the the # of grams you need).
Link to the fertilator:
If you need any more help with anything let me know.