How bad is the phosphate?

[Notsolostfish]

My tank has been running for over a year, my phosphate always been 0.16-0.22 corals doing great tested today, and its 0.36ppm. I noticed that calcification slowed down, my alk went up from 9.6 to 9.9 and 450 calcium to 480-490. Mag also. How dangerous is the situation? I would lose corals overnight?

 

[Oldreefer44]

Don't think it is currently dangerous but you don't want Alk and Ca to keep climbing, As far as I know the phosphate number is unrelated to the others.

 

[NonstopSoda]

I don't think you would lose corals overnight, everything is still within range. I would just suggest a 10-20% water change and see if that makes the phos go down.

 

[boacvh]

I'd say high but not dangerous at all. Just work on bringing them down slowly.