I got a mystery snail a few weeks ago. It was a light blue color. Now it's shell is starting to turn white. It started by its head and is slowly moving down the shell in almost a perfect line. Ive read in a few places that this could be a calcium deficiency. I added some spinach on Saturday then my nitrites spiked so I removed it and did a water change. Then I bought some wonder shells thinking they would boost calcium but didn't realize it would raise my gh as well. My water is already at 150gh so I am apprehensive to add the wonder shells. Thoughts?
Current numbers
Nitrate: 10 ppm
Nitrite: 0 ppm
GH: 150 ppm
Kh: 120 ppm
pH: 6.8
CL: 0