dying 5 gallon tank

hi i am an amateur to keeping fish and have just recently bought my first tank with aeration pump (the tank is 14 ltrs aprx 4 gallons) i spent some time doing my research and allowed my tank to cycle for 4 days aswell as doing all the appropriate treatments ect.. i have just bought a shubunkin...

Hi everyone, I'm new here, and I'm really needing help with my 5 gallon fish tank. As far as I know, I'm doing everything right... the tank has been up and running for over 2 months now. I have a preset aquarium heater 78°F, and I do 20% water changes weekly. I've been replacing the carbon in...