The Shark Tank

Hello all, I got this juvenile angel 3 weeks ago from my local fish store. Starting about a week ago, I noticed that his/her poops were coming out long and stringy and staying connected for a long time. The poop is typically pale red-ish or brown-ish in color. I've read mixed diagnoses online ranging from parasite infection to constipation, but would love a second opinion (I am relatively new to the hobby). Other than the weird poop he/her has been acting normal and eating well. I do small feedings twice a day with Hikari micro pellets and Fluval bug bites (algae wafers for the bristlenose), and the occasional frozen bloodworm snack. I don't see any other visible signs of stress (sometimes his/her stripes fade when the light turns on/off or every once in a while throughout the day, but they're never gone for very long), all other fish are active and healthy. Water parameters have been consistent since I got him/her. Water parameters: Temp 79F | PH 7.5 | CL 0 | KH 50ppm | Ammonia 0 | Nitrite 0 | Nitrate 10 | GH 200-300 (I have very hard tap water) Tank: Top Fin 55 gallon | Tank Age 72 days | Filter Fluval 307 Stock: 9 Rummynose Tetra | 1 Scalare Angelfish | 1 Bristlenose Pleco Pictures attached. Unfortunately he/she is not the most photogenic, so I circled the stringy poop in photo 1 to make it easier to see lol. Any advice/tips are welcome, thank you for your help!