I have two tanks one cold one tropical but in my cold water tank the fish are becoming inactive and bottom sitting. I have 4 fish 3 goldfish and one shabumkin in a 50 litre tank with sand a filter a bubble blower and a live plant. The shabumpkin is looking pale.
I have run a water test nitrate levels are a little high but not dangerous and ph levels low but not dangerously so. Any ideas please help I love my fish and know how quick you have to be with fish illness. I am really attached to them.