Do my readings make sense?

mjw011689

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Ok so I’ve had plenty of successful tanks over the years, but never really tested much. I definitely never really got too much into the sps stuff, b it had plenty of lps, but mostly softies that didn’t seem to care about water quality. I’m beginning to test things, and I just want to make sure what I’m getting seems correct

nitrates super high -100 (Salifert)
But phosphates are zero per Hanna checker.
Calcium seems pretty high at about 485-490
Alk is only 6.7 on Hanna.

I have a new ph test kit arriving tomorrow, but from what I’m seeing now, I’m expecting that reading to be low, correct?

is my alk low because my calcium is so high? And how would my calcium have gotten so high? I’m using tropic Marin for now, but to be honest, it’s been probably a few months since last water change, so I’m confused why calcium is high. Do I need to lower calcium to get alk up?

everything is mostly doing well, but it’s also mostly softies and rbtas. Had a green slimer that was doing really well and growing for a while, but eventually lost that (no doubt to lack of water changes and the poor conditions that came from that).

thanks for any input. I know this is not all the tests I need, I’ve got others arriving in A couple days.

As for nitrates this is obviously from the lack of water changes, so I’ll start there, but how would my phosphate be 0 if my nitrates are so high?
 
Calcium acceptable, alk low
Nitrate sky high if accurate and a large water change should bring it down
 
Thanks for the replies!

How does phosphate bind to the rock, and is there a way to prevent that? Or is it something where I just need to feed more or dose like you were suggesting?
 
I should add, I don’t really have any algae problems. In the past I had a bit of cyano but nothing major
 
Phosphate chemically binds to any exposed calcium carbonate surface, and the higher the phosphate concentration, the more that binds. it makes calcium phosphate on the surface.

Trying to prevent it is likely to cause a worse problem than the phosphate itself.
 

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