Changed some aquarium decoration added some driftwood and stones , the stones specifically was informed they not change PH did some tests saw my carbonate and ph very low did a 90% water change 2 days later PH and Carbonate going down again Im suspecting it could be related to the driftwood or maybe Fluval Stratum substrate - have a Betta, a nerite snail and some amano shrimp in the 10 gal tank with plants