Hi and welcome to the forum
You have a number of plants that are garden/ marsh plants. These grow really slowly when kept underwater and don't use much light or fertiliser. I would reduce the fertiliser and see how the algae looks after a month with less nutrients going into the tank.
I would fertilise once a week at half strength. Do a huge (75%) water change before adding more fertiliser. See how it goes and if the algae has settled down after a month, then maybe increase the fertiliser to 3/4 strength once a week and monitor for a month.