Great Book Knowledge, Ryan, but how about some Real World?
You are running a 29g tank with 2x65w=130w=4.5wpg (watts/gal)= too much light. You list low light plants (anubias, java fern, amazon swords) that are more than happy at 1x65w. Cut your lights in half and leave them at the 6hrs for now. Move them up to 8hrs, 10 max after you get things back under control.
Next, there is no way that the nutrifin is going to produce enough C02 for 2x65w on that tank. Highly doubtful that it will produce enough for the 1x65w, but even if it does--DIY is unstable. Everything is Great on the upswing, but then as C02 declines--algae shows up. You need a better C02 setup whether its DIY or pressurized.
Additionally, even if you produce enough C02--its unlikely that the ladder will be able to diffuse it, so you need a better diffusion method.
Algae Problems? =Too much light + insuficient C02 + unstable C02. Fix these problems and you will be well on your way.
Don't worry about your pH.<-----Right, don't worry about it--at all.
You don't even need to test for it. Why? Because it doesn't matter. Throw the pH/Kh charts out the window. We've moved on to bigger and better things (drop checkers), because the pH/Kh charts are way too squirrley and unreliable. So, throw the pH adjuster in the garbage where it belongs. All it does is add a ton of TDS to the system which is more harmful than any pH will ever be. And in your case, Yes, phosphorous. Yes, do the water changes as suggested. I would do an 80-90% and get most of it in 1 fell swoop, but I am plenty comfortable with that. You may not be.
Get a Drop checker, 4kh solution and your pH indicator solution--You'll be able to tell your C02 from across the room at a glance. Easiest and simplest solution there is, and accurate to boot.
Your Kh is fine. Your Gh may be fine also--really depends upon its composition. Easiest way to find out is either test or leave it alone for now while you fix the other problems. Test or let your plants tell you about your Gh. Its not a big issue right now.
Your tank is not in a book---its real world. So is the water in it and the plants. Here's a real world solution: Turn down your lights, do the WCs, crank up your C02, get a better diffusion method, get a drop checker, forget everything else, then sit on your hands and wait. Things will get better.
Edit: Agreed with mistergreen get a dosing regime--Here's the EI sticky: