scraping coralline messed with water params.

[bprewit]

I have slacked off on scraping the glass lately and tonight cleaned one half of the tank front and side and then a hour or so later cleaned the other half of the front. Man there was lots and lots of coralline floating around in the water for awhile and after it was clear tested the water and found this:
This morning alk was 8.3 DKH and calcium was 412
This evening two hours after scraping the glass the alk measured 5.8 DKH and calcium was 540. Now is something else going on here or did cleaning the glass have something to do with it? Any ideas?

[gjuarez]

Wow, I have never heard of that before. I sure hope that your critters are allright. I bet there was a major swing in your PH as well. Im definately tagging along for this one. I want to see what others have to say in this matter.

[JesterGrin_1]

Would like to say that you should shut off your skimmer for awhile if you would like your coralline to spread. Some people even do this to seed a new tank. They would gather the particles and then turn off everything then spread them over there entire tank let them settle then turn the pumps back on but leave the skimmer off for about 24 hours to let things settle. Sorry no help with the DKH and Calcium as I have not run across this.

[gjuarez]

I dont think he was any more coraline in his system. B, make sure not to raise your alk too fast, the sudden change could stress your corals and fish.

[bprewit]

AHH no more coralline! Man its one of those things you try to so hard to get growing and once it starts it goes crazy! It is growing slow on the rocks but grows like mad on the glass. I am not going to add anything to raise the alk instead keep testing and see what happens. Hopefully things are stable enough now it will swing back into normal on its own?

[gjuarez]

I wish you the best of luck. Maybe the coraline raised your calcium levels which brought you alk down. I dont know if its possible but thats probably the only explanation. Talk to Gary.

[bigdscobra]

Werid I should of tested mine I did the samething the other night scraped all the coralline with a razor blade but never checked my levels, which I hardly do anymore.

[GaryP]

I can't explain it unless there is something else going on here that wasn't mentioned. Scraping coralline shouldn't cause that.

[bprewit]

hmm I cannot explain it either! The levels all went back to normal slowly over a 24hr period. Now 8.3dkh and 425ppm calcium. Very strange indeed!

[bigdscobra]

At least everything is back to normal now.

[pilot_bell777]

I'm courious, have you tested across the day?

What is the readings at: 7:00am, 3:00pm, and 11:00pm

I've never seen something like this, but just courious.