Just curious, Do you have a target you would like your N/P to be? Or since your adding the KNo3 your target is 20ppm? Also isnt Np pro suppose to reduce nitrates... why dose kno3 just to reduce them?
Would your prefer lower phosphates or is .18 range a good spot for your corals?
Tank is looking awesome Btw! :thumbsup:
This is a bunch of good questions! And thanks!
My target.. hm.. my target has probably shifted around over time.. I'd say my targets for n and p are ~10 and slightly below .1 respectively.
Yes- Aquaforest's NP Pro, which is a carbon source (like vodka or sugar or vinegar or Red Sea's nopox) is for reducing nutrients and works primarily on nitrate - as is the case with all of them..
My cheato fuge, which is quite big, will pull n right down to 0 if I run a very long photo period and do not add nitrate.
However, my chronic and persistent po4 issue keeps p from falling as low.. this is why I was experimenting with Lanthanum Chloride for a while. It worked quite well but one of its side effects is reducing alk.. so over time, my alk was dropping while calcium was going up.. I decided to abandon LC..
Using my cheato fuge as the basis for nutrient removal, i tried to allow it to pull n down and then added some kno3 in an attempt to pull p down as well- this didn't work very well for me... SO! I started adding small amounts of np pro which is more efficient at pulling nutrients than cheato. I guess bacteria is a more efficient nutrient consumer than cheato.. but I'm not a fan of running a full bacteria based system.. why? Personally, I've always had rtn issues in my system when I really fire up carbon dosing..
Side note.. I know this is fairly common knowledge but I'll reiterate anyways, just to give a full picture.. cheato and/or bacteria are more efficient at reducing n than p and if they run out of n, they stop reducing p. The only way to get them to Get them to reduce p further is by feeding them more n.
SO! This approach is to keep the cheato as the foundation to pull nutrients while topping off with kno3 and np pro to pull p down.. since without the kno3, my n would bottom out..
SO, I have overshot my kno3 dosing and will increase np pro (I'm still way below the recommended dose of 14 drops/day) to be able to maintain nitrate while reducing po4.
So far it has worked.. the current dose of kno3 and np pro has kept p at or just slightly above the level it was at when I was dosing LC.. before I started the LC, n was around .24..
Now, I will go to 7 drops/day of np pro for a few weeks and see if (how) nutrients continue to drop..
So, yes, I would prefer lower po4.... although, even at the levels they are at, the corals are keeping great colors.. but maybe not growing super quickly.. which is fine I suppose, this requires less intervention on my part when corals grow into each other. I have cyano in the system, some dinos I think as well so I do want to control nutrient a bit more..
I really like the idea of adding nutrients as well as a small carbon source to feed bacteria to remove the nutrients.. it's another aspect of the so called high energy reef- high nutrient input and aggressive nutrient export.
With all of my nutrient swings over the last few years, I've come to notice that when it come to nutrients, the actual level is not too important. Corals are most happy when levels are rock steady, generally happy when nutrients are on a slow rise and most unhappy when nutrients are dropping- and the faster they drop, the less happy the corals are... and obviously, if either n or p is completely stripped, super pale corals are the result...
This is not a hard and fast rule.. there are few hard and fast rules.. just my general experience..
I hope this answers all of your questions!