Gfo strips what out?

[davilahope]

About a month or two ago I got my first micro gonipora and it was doing great for the first 4 days til my alkalinity dropped too much due to me using gfo and not monitoring my alkalinity.. my goni is only extending some of its tentacles and only partially!! I believe the flow and the lighting is ok because it's not bleaching and i did already get some polys extension before my alkalinity dropped.. can anyone explain to me maybe what all did the gfo strip out of my tank and what I can do to help my gonipora? The rest of my corals seem to be doing ok
My alkalinity is now 8.8dkh but it dropped to less than 6.0 before I noticed it was dropping so much.. my alkalinity has been back up and stable for about 2 weeks now

 

[Dkmoo]

what's your PH, Mag and CA, NO3 levels before and after the GFO? all these 4 params can impact alk levels.

 

[Hydrored]

There is a discussion on this ongoing-

https://www.reef2reef.com/threads/effect-of-gfo-on-alkalinity.779435/

 

[davilahope]

what's your PH, Mag and CA, NO3 levels before and after the GFO? all these 4 params can impact alk levels.

At the time I didn't check my ph level, my magnesium was at about 1300, ca level was unknown due to a faulty test kit. Nitrate level was definitely below 8 and today is at a 6 or 7

 

[Dkmoo]

At the time I didn't check my ph level, my magnesium was at about 1300, ca level was unknown due to a faulty test kit. Nitrate level was definitely below 8 and today is at a 6 or 7

ok check out Hyd's post above - randy gave a very good explanation for your problem.