Hello fish owner 24 im glad to see you got the k2SO4, your plants will likely benefit from a micromix dry fertilizer and if necessary a
gh booster( general hardness mostly measures how much
magnesium and
calcium is in your water). Gh booster is only needed if you have soft water with a low gh reading. As far as a micromix goes the best micromix i have ever found is sold by green leaf aquariums we have it here in the US. Make sure you get their EDTA+DTPA chelated micromix. This just means the chelated nutrients will be in a usable form for plants at a certain
ph. So if you have an iron deficiency this will solve that. Then all you may need (if its not present in your tap) is magnesium and or calcium from the gh booster. Your tank may already have this in your tap if it has a mid/high reading of gh. So if you have hard water skip the booster. Beware the gh booster from GLA has
potassium in it which you are already adding.
If you want to simplify everything just get the micromix EDTA+DTPA. Then dose a small amount once a week and see how your plants do after a few months with your regular
water changes. My plants exploded after i started using that very micromix. Deeper colors and better growth overall.
FYI- if you dont have a mixing container either DIY or buy one it would help to make things easier when mixing salts. So you just measure them all once every few months then add a certain amount from your container.
You likely have enough light even for aquarium lillies especially because the light intensity is higher closer to the surface and the lillies have no trouble sending leaves to the surface.
Also as was mentioned your plants may still be getting used to submerged growth. Pale leaves tells me some sort of micro nutrient is missing.
As for the algae likely more plant mass in your tank with a good water change schedule will get rid of those. Maybe tweaking the lighting hours. Adding a few algae eating species may help too.
Nerite snails,
amano shrimp,
ottos. Try and get rid of the problem first.
Ammonia can even be a problem.
What creatures eat diatom? | Algae Forum