Tank transfer didn't go well

[GreenSpottedPuffer]

Originally Posted by Borderjumper

If the sand released anaerobic bacteria you wouldnt see it and tests wouldnt pick it up. This also could mess with the oxygen in your tank.. fish ok?

I dont think flow change would kill them this fast.

I would be amazed if anaerobic bacteria was able to colonize 1 month old sand, especially the very top layer. But I guess thats possible. Just that from what I read, it takes a while. Would make sense though if thats what happened.

Fish are fine. Water is crystal clear and actually I was amazed at how clear it stayed through the whole process.

One thing I learned from this was that my old tank was VERY clean. No detritus anywhere. I was super happy about that.