I have a 55 gallon tank setup bare bottom with a sponge filter, (2) Aquaclear 50s, marineland heater set at 86. top fin digital thermometer reading 85.8. PH is 6.4-6.5. I picked up (8) 2-3" Santarem Discus from a local breeder. The local breeders setup was very nice and clean 55 gallon identical to mine(even in painted bottom color. Trip was about 40-50 mins between my location and his. his PH was said to be 6.6 and his temp read about 86-87. I took a large cooler with me and placed them in some large 3 gallon ziplocs and also took some extra tank water of his to hold the temp up in the cooler. Cranked the heat in the car all the way home. Acclimated them to the temp for 10 mins, mixed some tank water into the bags for another 15 mins, then let them loose. Left the lights off for an hour to try to let them settle. Last night I fed them frozen brine shrimp by Hikari. Six of the eight of them look like they are doing well. still skiddish but they eat and aren't breathing heavy. Two of the fish look darker and breathing heavy. I expect this from one of the fish as he was getting nipped and has a sore spot on his side on his slime coat. The breeder told me he was out of town and didnt feed them one day and they started nipping him? The fish I am concerned of is another one that is darker in color and breathing hard. He also randomly flips out and swims circles in the tank / breaks to the surface and runs into stuff. He has a small sore on his side that is from him running into the filter intake (which i actually saw him do). I did a 30% WC last night after feeding them. I vacuum after feedings to clean the bottom of the tank. My ammonia readings are zero / nitrites are zero / nitrates are zero / PH is 6.4. I used an API master test kit. My water changes will be daily at least 30%. I have a water storage can with a heater / air stone to keep the water temp the same. Only additive I use in it is prime by seachem. I have another 75 gallon tank with angelfish / tetras and a 29 gallon with platys that are all healthy. Is there anything I can do for him or just stay the course? Is he just an emo / suicidal fish?