Temp 82. Gravel is approx 1" thick. While I was at work, all the fish almost suffocated. Bf saw them gasping for air. Wisely, he did a 25% water change with prime, and the fish calmed down. Honestly, I don't know what I'm treating for. That's the problem. I had 4 baby angels. After 2 weeks, the smallest got torn tail fin. I started the 50/50 tap/bottled water changed to lower the 8.2 ph. His tail looked as if it was getting better. Then, he stopped eating, started hiding, then for 2 days FLOATED around the tank (second day the hsp tank). After death, I could see his side fins were almost half gone. No fuzz around the edges, just gone. This fish was not bullied. It just happened. The next day, the larger coy marble angle began staying at the top, clamping fins, and shimmying....But still eating. I was scared. I put parasite guard in (after watching him for hours). He showed some improvement, (and I misread the instructions.....thought I was supposed to just change water and put filter back after 48 hours). So after I replaced filter, sparkle got 90% worse in 1 hour. He crashed at the bottom, and stayed. I freaked. I didn't know what to do. If JUST did a water change. Bf came home, and did as I said (decided the problem was bacterial, raised ph with just tap and prime, added new meds. Today, I added the next dose of meds. Shawn came home to fish gasping at the top. Sparkle actually looks a little better. The "bruise" under his Gil is smaller, the spot his side fin meetsllun e body is more white. But they're all shimmying and their colors are dark (as if mad or distressed). I'm seriously thinking of putting the filter back in, puttin peat in tomorrow, and hoping. .....I wrote that last night. Forgot to send. When I woke up, the were all swimming around ! I was happy until I raised the lid and noticed its 84 degrees. I'm thinking that won't hurt them, but wondering if they are only swimming cause hot. And boy is the tank a cloudy mess. I think I will try to finish the med combo, but I will do a 20% water change each time to make it hit them less. And do a larger change if I see signs of stress. Because sparkle had something wrong before I started all this, (and its hard to believe shimmying, hanging, and a gill color change is all due to my mistakes with ph). Any advice is welcome!