Please help with ph and alk

[blades326]

I am now having problem keeping my alk in the 8 to 10 range due to corals demanding more as they continue to grow. the problem I am having is now in wi i am able to have the windows open in the house and it has caused a substancal impact on my ph. all winter i was at around 8.1 8.2 so continually dosing 2 part and kalk was not a problem which helped me keep my alk around 8. (which btw is about as high as i can get it, dont know why). now with the house opened up my ph is always between 8.3 and 8.4 sometimes even over 8.4. what can i do to raise alk without raising ph. please help.

125 G SPS dominated reef NEP t5 40 sump/fuge
Cal: 440
ph : 8.2 (8:00am no light all night)
nitrate:0
phosphate:0
alk: 6-7
mag:1450

 

[cilyjr]

one idea is to drip kalkwasser at night after the lights go out. if you are using a controller it would be easy to do.

also check your alk against a 2nd test kit before you do anything. i had what i thought was lo alk issues but reality i had a test kit that had gone bad. many local fish stores will check it for you often for free if you are at least semi regular customer

 

[disc1]

Use baking soda to increase alk with minimum effect on pH. You can use a commercial 2part recipe 2 or Randy's DIY 2-part from the chemistry forum.

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