Thats way too much light. Lighting is finding the balance between plant growth and algae growth. What people usually find is this is 6 to 8 hours lighting per day. You will have to find your own balance but 13 hours is too much. Dial it down to 6 hours, see how things progress over an extended period of time (at least a month) and adjust again. If the algae clears up you can then look to gradually increase the lighting. I would do a thorough manual cleaning too, gently clean what you can off the leafs. Maybe up the water changes to ensure nutrients arent too high. Dosing fertiliser to the correct dosage with your water changes.
You need a balance of light, nutrients and CO2
. Too much of one and algae will take advantage. Low demand plants dont need much in the way of light, nutrients or CO2
so if you flood the tank with light or heavily dose nutrients the plants cant take it all up and algae will take up the excess. You need the right amounts for everything to be balanced with not too much excesses for the algae to be manageable.
is no substitute for CO2
and adds no CO2
to the water. Its actually a mild algaecide that will help keep the plants leafs clean and they can then more easily take in CO2
from the water. It wont be doing anything with the heavy levels of algae you are seeing.