I have my goldfish princess. I have noticed over the last two days, she has been hanging out in the bottom of the tank in the corner behind the big scuba bubbler. She is eating well and every so often will swim calmly. She is not gasping for air but there is a small red spot near her gill and I have done water testing. At present all levels are within normal range except my PH. Its registering acidic. I use the jungle quick dips. I did a 50% if not more water change yesterday when the behavior started. Does anyone have any advice? I love this fish and so do my patients.