CRS TDS spike?
so the other day i got my TDS pen because someone advised me that my CRS weren't in the right parameters. My CRS tank is about 5.5 gals and i lowered the TDS to about 150 with distilled water. So i measured every hour about for maybe 5 hours (it was fun testing out my new TDS pen haha) and it was pretty stable. But when i came home today i was just curious, the TDS was over 230. How did this happen? in my tank i have ada amazonia. any thoughts?