Kh off the charts?

Ph is 8.0
Ca is 420
Ammonia 0
Phosphate 0
Nitrate and Trites 0

And my kh is like 20, I have the API test kit.

I dose Kent 2part a and b everyother day and everything has been stable for a few weeks

How do you lower it?

 

I would suspect the kit first. better to get another test kit or test water at an LFS before throwing things at the tank to solve a non-issue...

 

It's a brand new kit, just bought yesterday, I'll bring some water to the lfs in a bit

 

even more reason to suspect it... maybe it's been sitting in the store for a while? does it have a date on it?

Also, there is no need to immediately lower your alkalinity... it will precipitate out if it is that high. I don't think it's possible for it to get that high without throwing the calcium out of balance and well below 400, which is why I suspect the Alk test kit...

 

Yeap start with the test kit. Test it against the one at the LFS and test their water with your test.

 

How do you know how old an API test is?