Over Kalking when killing hydroids?

MarcPinsky

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I got some unwelcome additions when I bought a new piece of pipe organ coral.
I killed the 2 aptasias by my usual method of baking soda slurry and it worked fine. However, about a week + after this new addition I also noted the presence of hydroids (tiny brown feather duster looking critters w/hard tubes). The baking powder method did not work on them so I went for a Kalkwasser slurry (pH 12 so I am hoping it will be caustic enough). I treated the multiple areas where found and it seems to be working. (I have a heavily rocked 65g tank and can't remove the affected rocks). However, The kalk treatment causes a localized snowstorm in treated areas and leaves a snow covered peaks thereafter. Hope this kills them all.
How badly will this be for the tank? I added about 3 teaspoons of Kalkwasser over past 3-4 days. Before tx the Ph was 8.3, Mg approx 1600, A/N/N were all 0, alk was between 3.6 to 4 meq, Ca = ? (I realized my test kit was almost 2 years expired), salinity via refractometer = 1.026.
 
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The calcium rise will not be important. It is just the alk and pH rise that is a concern, and the local precipitation of magnesium hydroxide that you got (the white stuff) helps this.

It will dissolve, but depending on flow, it may take a while.
 

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