KH and pH Decrease

[The-Raven]

In just a week, my KH has gone from 300+ to zero. And my pH from 7.4+ to 6.4

The only thing I have done differently is that I haven't changed the water. I do have a bubble bar, which I heard would help stabilize pH, but I didn't think it would be this fast...

Is this harmful, should I be worried?

 

[Gourami Lover88]

Yes you should be worried even a small drop in pH is stressful. I dont know why the Kh droped and if you didnt know the higher the kh the harder it is to lower pH. I would wait to see if the ph and kh stay stable so keep testing.