No, I just have quite a bit of calcification in the area I dose. It was because it was too stagnant for a while. It's alot better now bc I added a powerhead but i think it's still happening. I am not sure what else to do except dose slower, which I can't do with my current pump. But my real concern is, could this impact the seems. It's def touching them but I don't see any visible penetration yet.