Nitrate / Phosphates

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These two are the things I constantly struggle with.  I got my phosphate and nitrate down to zero (not ideal I know but compared to high readings I had previously been getting I was quite happy).   Phosphate readings from reactor today are zero but from tank are 0.15 - nitrate is reading between 15 and 20 (from tank and pellet reactor).  Did recently change pellets in reactor so maybe it takes a while to kick-in??  The only other thing I have done is change from rinsed frozen food to pellets as going on holiday shortly and need to use that.  Also changed the carbon a couple of days ago.  Do weekly 10% water changes and another due tomorrow so will see what readings are after that.  Anything obvious shouting at you as to what I am doing wrong?  Does pellet foot contain higher phosphates than frozen?

Carol

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Reply #1

I would say yes but I cant prove this. Biological processes ,eg the fish making and breaking down bone makes phosphate in thier waste. If as is often the case with complete food it is high in protein bulking agents,put simply it has much much more nourishment in it than fresh frozen,there fore you have to feed much much less.


I dont ever have a problem with phosphate ,but ive recently put some good grade charcoal in the sump,so I expect to see some. In anticipation I have also put some phosguard in there.


Rest assured that the test kits we use will not detect the very lower levels of both phosphate and nitrate,so when I say my results are zero ,they in fact are not,just undectable.


All I could suggest is that may e you overfeed? My fish only get one cube if say mysis twice a week ,simetimes ince a week ,thier fat and happy on that.
Do not mock the snake because it has no horns.For who is to say that one day it may become a dragon,as one just man may become an army...Water Margin.

Debbiem

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Reply #2

yes thanks Carol - think I must have been overfeeding on the pellets - will reduce it down and see what happens - feel much happier with the frozen as I can see more what they are all getting but needs must and I need a holiday!!!  Anyway, worse dramas at the moment - skimmer has just decided to pack up!  Oh the joys!  :damn:

Carol

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Reply #3

Oh bloody hell, dont panic I had mine waiting for a replacement impellor for about a week  the nitrate didnt rise,but then I do feed like an anorexic lol.



Do not mock the snake because it has no horns.For who is to say that one day it may become a dragon,as one just man may become an army...Water Margin.

HK_Fuey

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Reply #4

Flake and pellets are way higher in phosphate:protein ratio than frozen.  Have a look at this:
Aquarium Chemistry: Phosphate And Math: Yes You Need To Understand Both — Advanced Aquarist | Aquarist Magazine and Blog
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Gav

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Reply #5

You could test them , I carried out a simple test for Marty a few weeks ago on my new pellet food , and was quite amazed at the phosphate reading from such small amount of food , think it was ten very small pellets in 100ml of salt water for an hour , test before adding to get start Po4 level and an hour after adding test again . To compare different foods this may require being done by weight ?

Gav

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Reply #6

This is the test I carried out ( copied from my tank thread )

Marty just started that food phosphate test for you this morning , didn't get a chance last night . So here's what I've done :
1)Made fresh salt to ..1.025
2) Check phosphate level .... It's coming out at 0.06ppm straight off the mark ? Should fresh salt water have phosphate ? (Red sea No3 Po4 algae control test kit used , the one for dosing Nopox)
3)Added 100ml to jug and added 10 to 12 pellets and have left to sit for an hour
Result to follow shortly

 

* IMG_20160921_093910.jpg (487.18 kB, 675x900 - viewed 7 times.)
Marty , the result is 0.7ppm Po4 total or 0.64ppm allowing for the 0.06ppm started with , I'm quite amazed at that as there seems very little food to water , I gave it a good stir too before testing just to ensure anything could be released . Just to add everything cleaned with RO before and during test so no cross contamination .

Thanks:


Debbiem

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Reply #7

You could test them , I carried out a simple test for Marty a few weeks ago on my new pellet food , and was quite amazed at the phosphate reading from such small amount of food , think it was ten very small pellets in 100ml of salt water for an hour , test before adding to get start Po4 level and an hour after adding test again . To compare different foods this may require being done by weight ?
Oh my!  Nothing in marine keeping is simple is it!  lol 

Gav

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Reply #8

The ten or so pellets were under 1 mm across , tiny in comparison to the amount of water , I haven't test any other foods for comparison , I think this would need to be done with equal weights of foods

Thanks:


Marty

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Reply #9

One day the holy grail will be found for N&P and marine keeping will be a breeze.

It has come a long way over the years from not being able to keep much alive to full on reefs today so things are going in the right direction.


Debbiem

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Reply #10

One day the holy grail will be found for N&P and marine keeping will be a breeze.

It has come a long way over the years from not being able to keep much alive to full on reefs today so things are going in the right direction.

Marty - unrelated - but can I use my biohome as rubble in the bottom of my planned refugium?

Marty

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Reply #11

Not under sand you can't I looked into that for mine but was advised against it.

Debbiem

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Reply #12

Under sand?


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Marty

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Reply #13

I presently have mine like this




Debbiem

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Reply #14

I presently have mine like this


So I could put same sand on the bottom (do I need any?) then my biohome and cheato with a light?


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