Are You dosing Flourish Iron 3x per week? And adding Potassium to your water changes? Usually fish waste and excess food will take care of nitrates and phosphates.
You'll need at least 2.5 watts per gallon for those Swords. Three
wpg would be better and it won't stress the fish at all. They don't care. At 2.5 watts plus you'll need pressurized
CO2 which will really help jump start things, but that definately raises the ante in money and time needed to check you
ph and
kh levels etc. You might ask Rex about a great source to dry dose potassium to your water changes. I saw a really great deal on a Milwaukee "All in One regulator/solenoid/ bubble counter" at the aquatic-store.com for $79.00. Of course you would need a tank with
CO2 as well (welder's supply) and maybe build a
DIY reactor or buy one to get into
CO2 on the cheap. Well, nothings free in life these days.
I've ordered a D1 Vortex diatom filter to supplement a moderate green water problem I am battling. $65 bucks for the D1. Or you can use a HOT Magnum with micron filter to help with GWA. One needs Lots of fast growing stem plants to keep various algae problems in check, so I have read. But they need plenty of light to grow fast. No more than 12 Hours of lights too. I've had good luck with Wisteria and Green Hygro growing too fast.
I would be careful not to overdose the flourish products. It so easy to do when you want to "help" them grow. I've cut back on Iron 50% for now till I get my GWA in check and my tank back in balance.
HTH