Hop if you ask me you started dosing that tank too early. That tank is barely 4 weeks old. Algae thrives on excess nutrients and if the plants are not acclimated and "hungry" they just plain dont use up anything and the algae takes hold quickly and strongly.
I firmly believe that in the first 4 weeks of any new tank you should add NOTHING but a supply of fresh water and the micro's in the tap will carry the plants through that first month. If you look at the list of ingredients in tap water...well water or
city water it actually has in it everything plants need , just not enough for what we put them through with lighting, we make demands... LOL
I think we all tend to get fertilizer crazy and think that the plant will die if I dont feed it NOW...thats hogwash and it leads to algae.
The bad part is once you get that algae it takes twice the amount of time to balance the tank because now the algae we created is just as hungry as the plants and everybody thrives until the stronger of the two win the battle for food.
This is why if you look you will see that 90% of the tanks that have algae problems are under 4 or 5 months old...well before the plants need
more nutrients, we give them more nutrients. They only uptake what they need, not what we give them.
Think of algae as fat...the body only gets fat if we eat more calories then we burn.
The fastest way to get rid of that algae is not to feed it...I would do a large water change and not dose any nutrients . Wait 4 or 5 days , do another large water change for the (micros) in it and then just watch how the plants respond...dont add ferts till you look in that tank and see
that they need to be fed. Basically, you need to get them plants hungry ... and dont worry, they wont die overnight...LOL
In your case, I imagine that by the second week you will see a much weaker , dying algae and some hungrier plants.
Then start dosing slowly when the algae is at its weakest...it could take longer, just remember , wait to start dosing as long as possible...it will save you some money too ! LMAO
Plants can store nutrients, algae cant, without a source , it will