u/HotDevelopment8434

EDIT: TESTS MY HUSBAND DID JUST NOW ARE IN THE COMMENTS I think he's color blind I swear our nitrite is high .

My husband and I have barely started our aquarium set it's a 38 gal tank we have guppies, mollies, tetras 1 ghost shrimp & 3 snails we started in April. Some fish from our first batch are thriving but we have lost some since then. The recent batch we got have started to die we've done water tests and everything is fine. we even added a pothos to our tank yesterday. Could this just be due to the fish having prior issues? Also how should we do water changes? Is it recommended to remove the fish into a container prior to the water change? TYIA