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Sorry for the late reply! I put in two tablespoons, and my tank is 60 litres. I went to my local fish store and the employee was just as stumped as I was, we suspect atm is maybe too much oxygen in the water as the airstone is on full, but I'm not sure. Unfortunately one guppy has already died...

Nutrafin aquaplus water conditioner

It's very new, expires in 2026, and the bottles were shaken for 1 minute as per instructions, but I might try test again with more vigorous shaking

I'm unsure of the brand. It appears to be a biological sponge filter with a spray bar, but all the seller told me was that it was from aliexpress

Thank you, I'll get on the water changes asap. The tank already has an airstone and the healthy fish seem like they're breathing okay, but would another one be needed? The sick fish have very red gills and are struggling with breathing and they almost look extended.

I did the tests as accurately as I could following all instructions. I'm not too sure about GH but I'll test that soon with one of my test strips. Water is always declorinated before going in the tank. Filtration is biological I believe, the filter is very cheap and old, came with the guppies...

API freshwater master test kit

Sorry was unsure if I replied to you both properly as I'm new! They should be in the thread regardless, thank you for your help!

I did not, however, they were in the original tank I got the guppies in and had been living with them without issue for months before I switched the guppies over to a bigger tank. I was on the fence about adding then so I kept them in the old tank for around a week.

I believe mostly is, it was a bit of a emergency set up but its been two weeks without issue, and I check daily. No Ammonia spikes at all have been detected, no Nitrite spikes and nitrates present. I moved everyone into a bigger tank as this was a rescue job, with their old filter and plants.

I noticed one of my guppies swimming weirdly, in a downward spiral and unable to keep itself upright. It's gills were also horribly red and inflamed. A few minutes later, after I took the fish out, another has fallen ill also. All tank parameters are in the ideal range, 0ppm Ammonia, 0ppm...