Very High Alkalinity

Hi guys I have a question about my alkalinity levels in a 34 gallon red sea max 130d. These were my levels.
Alkalinity:18 dkh
Calcium: 400
Ammonia: 0
Nitrite:0
Nitrate:0
pH:8.2
Salinity:1.025
Temperature:78.1
We raised the temp because our flame angel has a small case of ich
My question is how to lower the alkalinity to the desirable levels and how will the high alkalinity affect the corals in my tank.
Which are a kenya tree, some zoos, a monti cap, a colony of candy cane coral, and a hammer coral.
Thanks

 

The high alkalinity could burn the corals. I would do a 50% water change to help bring the alkalinity down.

 

Alright will due
thanks

 

Mind if I ask what your dosing your tank with to have such a high reading?

 

I would also consider double checking that reading...hobby test kits can be off...I always like to get a second opinion on readings that are way high or way low. I know people who have nuked tanks trying to fix a problem that didn't exist due to a bad test kit.

 

+1 on this.

 

I am dosing it with iodine twice a week and whenever the calcium was low I used a calcium supplement also I used the red sea max test kit and the Api test kit and they both had similar readings. I was using ich attack because my flame angel had ich so I had to remove the carbon filtration and turn off the protein skimmer. Could that have anyhting to do with it.

 

Is your calcium supplement a 2 part solution? What's the brand and name of it?

 

yes it is a part two its name is B-Ionic and we have only been putting in the second part because the first part is alkalinity and it has been high at about 15 dkh but today it spiked.

 

No, I am thinking accidental overdose.