Definitely not an expert BUT:
It sounds like your ph is dropping due to a lack of kh to sustain it. You could try crushed coral in a media bag in your filter. A Tsp at a time.
Pitting on snails can sometimes be cause by a lack of calcium in their diet but maybe it's the slightly acidic condition in your tank? This I dont know.
What I do, lol, kindof know is a term called biogenic decalcification where plants turn to kh when there is a lack of available c02 in the water.
These are just ideas and thoughts to get you started. Hopefully they're on the right track and lead somewhere.
It sounds like your ph is dropping due to a lack of kh to sustain it. You could try crushed coral in a media bag in your filter. A Tsp at a time.
Pitting on snails can sometimes be cause by a lack of calcium in their diet but maybe it's the slightly acidic condition in your tank? This I dont know.
What I do, lol, kindof know is a term called biogenic decalcification where plants turn to kh when there is a lack of available c02 in the water.
These are just ideas and thoughts to get you started. Hopefully they're on the right track and lead somewhere.