water problem

HEY GUYS THIS IS SUPER URGENT! So my Dalmatian molly (Sherlock) was doing fine ever since I purchased him. However, I just purchased a new tank with a filter and heater. I set the heater to around 75 degrees and everything was fine until this morning. One of my girls went into hiding in the...

Yesterday night I did a water test .. just out of curiosity my really were shocking My Gh was 120 KH 40 PH 7 NO2 1 NO3 160 ppm I panic and do a 30-40 water change , I re test this morning the results were GH 120 KH >40 PH7 NO2 0.5 NO3 80 The filter is new definitely doesn’t need changing , I...

hello,   so i have a 20 gallon fish tank with corydoras, black skirt tetras a dwarf gourami and platies, and it is fairly new only had it for about 3 months but do water changes 25-50% every weekend with conditioner and a week ago i noticed no matter how many times i changed a bit of the water...