Sorry it took so long - just got it tested at the store.
My water is 80 degrees, the ph is higher than last time at 7.4 (it was 7.1ish 6 weeks ago).
They said everything else looked fine.
The tank is 40 gallons been running for 1 year. I have 10 tiny embers, 1 big dwarf ram, 2 frogs, 2 loaches, 2 siamese algae eaters and 2 darios.
I've done 2 water changes in the last 3 weeks.
The cory is still alive and still behaving as if he is dying. I aimed one of the pumps up so it broke the water surface and he actually went up and sat on a plant like 2 inches under it. Not sure if it a coincidence because he can't really swim straight.
I did purchase an air stone yesterday, but I'm still interested in ideas of what could be wrong.