2 days ago Iāve gotten 6 new cardinal tetras to join my current 5 in a 20 gallon planted tank. I drip acclimated them for around 30 minutes and placed them in the tank without adding any of the bag water in. They seemed fine and got along with the other cardinals. The same day I set up a diy CO2 system that started up the next day.
However this morning I found that 5 of these new cardinal tetras have died mysteriously and were either floating around or at the bottom all belly up. The CO2 seems to have been on last night but only producing quite a small amount of bubbles even though I remember trying to close it last night. I have a sponge filter which I thought would carry on oxygenating the water if such a scenario occurred.
Why could they have died?
Iām going out today but as soon as I get back Iāll post the water parameters.
However this morning I found that 5 of these new cardinal tetras have died mysteriously and were either floating around or at the bottom all belly up. The CO2 seems to have been on last night but only producing quite a small amount of bubbles even though I remember trying to close it last night. I have a sponge filter which I thought would carry on oxygenating the water if such a scenario occurred.
Why could they have died?
Iām going out today but as soon as I get back Iāll post the water parameters.