Yikes. Expensive ! Take the algae bottle back and just use Excel or one of the other brands of liquid carbon, OR, there are other things you can use to kill algae.
There is no point in using both this product and something like Excel. There's little worry in using glut as a carbon booster, it's the most common way to add some carbon if you don't do C02 or can't do C02. Not as good but it does help with many plants.If you need to kill algae, best used as a dip, that way, no worries at all about overdosing the tank.
Other algae killers are available. You can use hydrogen peroxide. The 3% solution most drug stores sell is fine, just squirt it right onto algae in the tank, with a syringe or pipette, it won't hurt the plant or bother fish or the tank. It degrades fast into hydrogen and oxygen, so it's pretty safe. Can also be sprayed on the plant if you remove it from the tank, or used as a dip outside the tank. Dip, wait a couple of minutes, then return to tank. Rinsing is not needed.
Another one is alum. Used for pickling, you get it in the spice aisle or bulk food places maybe. Two tablespoons to a gallon and you can leave the plant in it overnight, up to 24 hours. Very safe, rarely causes any damage to most plants. If it's a very sensitive plant, just one tablespoon per gallon instead. Rinse well.
Potassium permanganate, if you can get it, works too. Just enough to turn water medium pink in colour. Use gloves, it stains skin. Like glut and bleach and oxygen, it's a strong oxidizer, so don't breathe in the powder either. I am unsure of how long you can safely leave the plant in this, probably only a few minutes though. Rinse well.
Bleach also works, a common dilution is 1 part bleach to 19-20 parts water. But it can melt some plants and you have to time it very carefully, no more than two minutes in the dip and then rinse very thoroughly. Most use extra dechlor when they put plants back after a bleach dip.
