Weird Absorbtion

[Charlie’s Frags]

Is it weird that my sps tank all the sudden hasn’t absorbed any calcium in the last week, only 0.5 dKH a day but has started absorbing mag and potassium like crazy?

 

[Flippers4pups]

Is it weird that my sps tank all the sudden hasn’t absorbed any calcium in the last week, only 0.5 dKH a day but has started absorbing mag and potassium like crazy?

Is that calcium or alkalinity that's slowed down?

 

[Charlie’s Frags]

Both

 

[Flippers4pups]

Water pramameter imbalance? Corals sometimes go through slow growth periods.

 

[Charlie’s Frags]

I suppose so, but why the crazy mag and potassium absorption.

 

[Reefer40b]

how much of a MAG change have you seen? maybe faulty test kit or user error possibly? recent batch change on salt maybe test fresh saltwater mix to see if levels are ok?

 

[Charlie’s Frags]

I doubt it. Salifert has been pretty solid. The mag has always been around 1350 with daily dosing and a weekly test. I tested Sunday and it had dropped to 1250. So adjusted and retested to get it back to 1350. Tested everything today out of boredom and it was 1200. So I added some more and now it’s back to 1350. I just don’t know why all the sudden the demand has gone up on mag and potassium but the cal and alk has gone down

 

[Graffiti Spot]

I would bet your test kits are off. I have had issues just like that with salifert mag and potassium after a year or two. I keep them clean and closed well and try not to let them sit for long periods. Unless this is a new tank, mag can be used up quickly when a new tank is added to a system or a new ones is set up.

 

[Charlie’s Frags]

Tank isn’t new but I recently switched to a basic zeovit set up. I just checked potassium with an elos test, which I hate bc it’s very difficult to read, but I tested somewhere between 400 and 500, salifert is reading 380. I checked the mag with a Red Sea test and for 1320 and the salifert is reading 1290.