A lot of Questions (GH/Phosphate/Nitrate,Dry Ferts)

Hello Everyone,

I've been a lurker around here for sometime. Anyways, I've been having a lot of trouble with plants lately. Especially since I've moved.

My tank is a 72 Bow Front, Seachem Black Flourish Sand, 260watts of Power Compacts(2 10k & 2 6700k bulbs they are on at 130w from 2-3pm and then 260w from 3-10pm then back to 130w from 10-11pm), and I got a pressurized co2 setup. Which currently is hooked up to a ebay diffuser and my regulator is set at 11psi, with about 1.5 BPS. My tank is also pretty well stocked with some small and medium fish, a pair of angels, a severum, and a ton of tetras.

My Tap Water has changed. At my current home, my water test's with a ph of about 6.4, amm: 0, nitrite: 0, nitrate: 0, kh and gh are also both registering as 0-1. I don't think my GH test kit works since it always shows 0 even after adding the equilibrium and the colors on the GH test kit suck.

So I'm pretty sure my water is basically dead and lacking almost all nutrients which took me about a year of living here and struggling with my tank to figure it out.

Now,
I picked up a bottle of Seachem Equilibrium 2 days ago, put in enough to get the GH up to about 5ish. Added some baking soda and got my KH up to between 5-6.

Since adding the Equilibrium, my tank has had a slight haze and a large amount of particles moving around. Did a 25% WC Today.

I've been struggling with plants of all types, they all seem to waste away, I've been dosing flourish comprehensive & potassium & a tad of the phosphorus one. I've been trying to get a hold of some dry ferts but I ordered from Rex Grigg, and 3 weeks later never heard from him and filed a paypal claim. Where else can I order? and what would be the best for me to order?

I have mostly swords and did have cabomba and some other basic plants all which have over the past few months since purchased just wasted away. My swords seem to turn yellow in the leaves and get brittle and start dieing off. I'm guessing my tank is lacking something critical even my algae growth is bar none besides a bit of green algae that grows on the glass, used to get a lot of black beard on the filter pipes and some plants (seems to slowed or stopped)

My Phosphate test reads a 0 (I used to read off the charts when I used to use Neutral Regulator back in the day when I first started with the planted tank)

Nitrate is a 0 but shouldn't the fish waste be enough nitrate wise? or should I be dosing. If someone can help me figure out these Fertilizer issues I'm guessing I'd be growing stuff like crazy.

So to sum it up,

I need help buying the right ferts, getting a GH test kit that actually works, figuring out what ferts I should dose and figuring out what my phosphate and nitrate should be at.

Thanks in advance to anyone willing to help.