Increased Alk and Calcium uptake
 

So I recently noticed a huge uptake in calcium and alk. Forever my tank seemed to be using too little. maybe about 50 mL a day each for both Calc and Alk on Seachems fusion 1 and 2. I mean it was steady for months on end. I recently starting dosing nitrates to get those up to about 5 ppm from 0 and also increased ,y Radions by 2% across the board. I noticed my also which I usually run at 150 ppm was down to 117 and my Ca was 420 so not bad there. I bumped up my Alk over the last week to 100 ml a day and it;s still not budging over 130 in the afternoon when I read it. Will let it run there a few days and see where it settles at. I have a 180 gallon with moderate SPS population. 1) What do you think could have caused this increased need....I don't haver any reason to suspect it's precipitating out. 2) If you use fusion 1 and 2 in an SPS tank how big is the tank and how much are you using?

SeaChem Fusion seems to be about twice the concentration of the DIY 2-part, so that consumption probably is reasonable, although towards the high end. The added nitrate and lighting might be encouraging more growth. Is there much coralline growth?

A decent amount on the back wall....but not on front or sides as I scrape that off but not that much more coraline algae than a few months back. I will have to take come pics tomorrow when the lights are brighter

I see no mention of Magnisum.
I trust you maintain at 1250-1350 ppm?

I have been dosing seachem fusion 1 and 2 for years, 70g mixed reef with some SPS and 3 Clams, and say 40 LPS.
I maintain Alk at 141 to 155 ppm with 4 ml per day.
I maintain CA at 420 -430 ppm with 3ml per day.
I maintain MG at 1360 ppm with 2.5ml per week.

Dosing seems a bit high, but each tank different.
Wow, even if I convert to match your 180, that's 10 times my consumption rate.

Could Mag have got out of the sweet spot? This could easily account fir the higher dosing as the ions would just come together and not be as available for growth?
Testing error?
Interesting post.....I hope others chime in here....

Your SPS have probably settled in and are starting good growth. I have a 180 G heave SPS and use a calcium reactor pumping at 117 ml /min iith a dKH of 21. If I was dosing 2 part I would be dosing a little over 341 ml/day.