Hi I am new here and my tank has a big problem. Two days after I got back from a three week long trip one of my cichlids and my Chinese algae eat both died. The tank also spiked. My PH is low, water is HARD, my testing kit says to add Buffer, and the Nitrates are high. My biggest and oldest cichlid is still alive and eating well but he now has this big bubble of cloudy mass over his right eye. It just appeared over night. Do any of you have any idea what it could be, or what to do about it?
Thanks