Water Chemistry

I just recieved my hanna phosphate checker (HI713). Tested my water the way the instructions said. Is it possible to have a bad reading after 3 tries? I have green hair algae growing and algae on my sand bed growing for about a month or two. Will it show any readings to measure? i want to make sure im doing something right or not. Ialso bought some phosphate rx should i still dose some to see if i get any readings after the fact?

I have a 93 gal cube some sps and lps and softies...
my lights r radion g2 at 45% put it up higher the corals start to die.
I have 2 mp10s
1 wp 10 for circulation
cal 440
alk 9
mag at 1500
phospahtes at 5
nitrates at 0
tank is over 2 yrs old transferred everything from my 75 gal that I had for over four yrs and everything was growing and coloring fine. I dose my alk and cal with brs 1.1ml for 4 hrs. don't know y my sps and some zoas are ...

Well just like the title says, my calcium is at 500 for the last 2 weeks and alk is at 8 which i keep at 9, my alk has only droppped 1dkh in the same time frame. My mag has been at around 750 from what the test says. I need some help as to what i need to be doing right... As for corals i only have fist size pink milli and 2 frags from that. I have 3 pink birds nest frags as well no more than half and inch long. 4 frags of grn toadstool. 4 grn mushrooms. 1 regular size ric. and a sm. ric that started ...

I have a bad case of the dino's and can't get rid of it. My tank is a 75g 55 gal sump section and fuge in one tank. My parameters are
ammonia 0
Sg 1.026
ph 8.4
nitrates 0
nitrites 0
phos. 0
mg. 1400
cal 430
dkh 9
I have 4 t5 and they are ati bulbs. Got them 3 months ago. I run my lights from 8:30 am to 8:00pm. Can't find a way to get a handle on this and its frustrating me. I have this problem for about 2 weeks. I heard of raising ph but ...