All fish breathing heavy out of nowhere.

[DonJuanAntwon]

Hey everyone,

Just checked on my tank (25 WB peninsula AIO) before lights came on and noticed all my fish are breathing heavy. I did a 15% water change a few days ago but just noticed on my apex that my pH dropped to 7.4 when it’s usually around 7.8. It could’ve been the nopox I dosed early this morning when I first got up? I always dose the same. I’m gonna do another water change but I’ve never really all my fish breathe heavy like this before. Just checked all my parameters

PO4: 0.07
NO3: 15
Ca: 468
Alk: 9.3
Sal: 1.025

Any advice besides a water change? The low pH (I guess causing low O2) is the culprit?

 

[Ironwill723]

Air stone or powerhead. Add some carbon just in case.