u/actually__annoyed

About 10 months ago I became a first time fish owner - 1 Oranda & 1 Black Moor. Our Oranda got really sick in the beginning & I just knew it was gonna die but luckily, she pulled through thanks to the infinite information & advice from this sub. So thank you! Pics from almost a year ago when she was so sick vs pics from last night.

Established tank. Just changed the water (40% ish) two days ago. Ph is reading high. Should I worry? How to handle it? I’ve never dealt with ph issues before. Thanks!

*checked parameters tonight because our black moor is hanging out at the bottom a lot…he never does that.