sorry for the late reply. Emma, the water in my city is fairly hard - not sure about the alkalinity/acidity. I have a 55 gallon with 5 clown loaches ranging from 2 to 3 inches. Right now the tank has 5 CL, 7 Striatas, 1 bristlenose, 5 Tiger barbs, 4 danios (for cycling the tank - they live forever :...