Others have mentioned more than I would start out with... but then again I haven't seen algae yet and my tank is pretty much as low tech as it gets.
You need to know the hardness of the tap water so you can figure out how much you want to cut in or of you can use it straight up. The fish that you listed are not needing terribly soft water so you might find that just treating the water and using it might work just fine... it would certainly be easier and cheaper. If so, you can just start using it for water changes... add prime to treat the tank volume, about a cap and a half or so, and fill from the tap.
You already cut the light, harder water will help the plants, if you drop all CO2 and let this become a low tech tank for a while the changes will be easier to manage. This can avoid doing anything with the ferts except adding a comprehensive trace type which will help.
Eventually the algae will subside and some, as mentioned, you may have to remove.
Good luck with whatever things you do try.
Oh, and post some pictures, it helps get a handle on some things that might not be really apparent in a description.