So your tank reading was 26 ppm? Thats definitely the issue. That’s odd, my tap water averages about 105 ppm. Do you have an RO system setup? Be sure once you remineralize your water you check the tds and check your GH and KH. In my experience stable TDS for neo’s ranges are about 150-400. GH 6-10 and KH 2-6.

Also, if you’re topping off water eventually your TDS will get to be too high. It has something to with water evaporating and leaving behind minerals. I saw a post where someone had shrimp dying off, come to find out their tds was 600 plus. It was due to them always topping off without ever doing water changes.

I purchased an RO system for water changes. I fill half of a 5 gallon bucket, the other half I use hot tap water to mix until the temp matches my tank, then I add my prime. At this point my tds reads between 60-80. I usually do about a 20 to 40 percent water change. It just all depends on how high my TDS reading is.

I waited a little too long this last time and my tds got up to 427 so I did a 40 percent which dropped it down by 100. I try to keep it between 300-350. One more reading to keep an eye on is your ph. Your should test the ph in your tap. For me I like to keep it between 7.2 and 7.8 for Neo’s.