Phosphate and nitrates

[salty105]

Help!

For the life of me I cannot keep my nitrates and phosphates from tanking.

I used to have a 20 gal reef tank and the nitrates and phosphates would not come up with just feeding and bio load so I had to dose. I chalked it up to not having a lot of fish in there seeing it was just one goby And 3 coral frags. This ended up in a giant dyno outbreak.

I have since upgraded to a 100 gal system with
2 clowns
2 dispar anthias
4 green chromis
And my trusty watchman with his pistol

The tank is 2 months old now and the nitrates and phosphates are steadily decreasing. I’m not doing any water changes and the only filtration I got going is filter socks.

These are my levels as of today. I’ve been working getting magnesium and calcium up (I just started testing for those last week) and I’m also slowly raising my salinity to 1.026

I have an auto feeder feeding three times a day and I supplement with either fish eggs or mysis shrimp once a day.

What am I doing wrong?

 

[lapin]

As things grow in a new tank they will use more nutrients than an established tank. Could be what you are seeing.

 

[mboley]

You're doing nothing wrong; your tank is just using up the available calc, mag., N and P.
Its not unusual to have to dose N and P; I do both. I use ammonium carbonate for N and TriSodium Phosphate for P.

You dont have enough fish in there yet for feeding to make a difference.

 

[salty105]

You're doing nothing wrong; your tank is just using up the available calc, mag., N and P.
Its not unusual to have to dose N and P; I do both. I use ammonium carbonate for N and TriSodium Phosphate for P.

You dont have enough fish in there yet for feeding to make a difference.

Ok thank you! Can I expect some of these nutrients to level out or should I expect to keep dosing? I just don’t think I have enough coral to drain mag and calc it’s literally like 5 small frags. I’ll start dosing nitrate and phos again tho!

 

[Randy Holmes-Farley Verified Community Expert]

If you raise the salinity to the ocean average of 35 ppt (sg = 1.0264), both calcium and magnesium will rise by about 10%.

 

[salty105]

If you raise the salinity to the ocean average of 35 ppt (sg = 1.0264), both calcium and magnesium will rise by about 10%.

Perfect that’s what I’m working on first before dosing too much calc and mag. Thanks

 

[exnisstech]

If you do have to start dosing to keep N and P detectable I've had very good luck with ammonium bicarb and diy phosphate using Randy's recipe. I've had to dose my SPS tank since starting it 3 years ago to keep N and P detectable. I've never tested mag

 

[salty105]

If you do have to start dosing to keep N and P detectable I've had very good luck with ammonium bicarb and diy phosphate using Randy's recipe. I've had to dose my SPS tank since starting it 3 years ago to keep N and P detectable. I've never tested mag

Perfect I’ll do that! And yeah fair enough I never did in my last tank and everything did fine. Guess the lfs guy just got me convinced to buy the test kit and then the mag supplement

 

[BryanM]

I would consider it a good thing if one has to dose N and P to maintain levels. Most of us are trying to reduce them.

 

[Randy Holmes-Farley Verified Community Expert]

Perfect that’s what I’m working on first before dosing too much calc and mag. Thanks

I’m also suspicious that the magnesium is not as low as you think. Mag tests are so inaccurate that I do not recommend them, and a 100 ppm drop in magnesium by consumption cannot happen without at least a thousand ppm of calcium being consumed the same way.

 

[salty105]

Perfect that’s what I’m working on first before dosing too much calc and mag. Thanks

I’m also suspicious that the magnesium is not as low as you think. Mag tests are so inaccurate that I do not recommend them, and a 100 ppm drop in magnesium by consumption cannot happen without at least a thousand ppm of calcium being consumed the same way.

Gotcha, I thought it may have been because the tank is only two months old and I used uncured dry rock for it. And maybe it was absorbing some of those elements. My alk was also very low in the beginning which I have fixed now. I know for a fact I don’t have enough coral to be consuming these elements so could it be something else? Or just salinity is low and my mag tests bad? My calcium is also really low.

I’m using the instant ocean purple, I’m planning on testing fresh salt water and seeing if that was the issue. And when I run out the salt I got I’m switching to another brand.

I’m not overly concerned about the levels at the moment seeing most the coral I got is doing just fine. Except my nepthea is struggling which I guess could be because of that.