Hi all. Would like to check in for an update.
I've been doing ~60% water changes these past few days, pre-treating my tap water with Nitra-Zorb (which lowered tap water nitrates from 20 PPM down to <5 PPM).
These past few days, a common pattern has emerged:
- Largely inactive, relapsed behaviour throughout the day (mouth shut, not breathing, surfacing for air every ~20 minutes)
- Closer to feeding time, he would start grazing around and breathing normally
- During and after feeding, he would be very active, breathing normally, acting almost 100% recovered. This would continue well into the early morning (at least past 2 AM, and sometimes I would catch him at 6 AM acting very much normally, sucking on glass etc.)
- By the time I get up at 9 AM or 10 AM, he would have "relapsed" again, and the whole cycle continues...
My CO2 test kit has arrived, but the seller forgot the O2 kit. I will collect a set of measurements for the morning, afternoon, and night time.
What concerns me the most right now is actually his eyes. They seem to have gotten even more cloudy, though he still seems visually alert:
It's hard to capture on camera, but from the side, it does look like it is largely limited to the cornea, and not any deeper:
Cross referencing past pictures, it does not appear the eye is bulging, but I can't be 100% certain. At this point, can we still rule out bacterial infection? All the guppies are doing fine so far, nothing to report for them. Overall nitrate level in the tank is well under 10 PPM now.
Appreciate all of the replies so far.