I’ve noticed at the edges of the fins of some danio’s and neons have a white tint to them.

Is this something wrong? Currently one of my danios seems like it’s dying:

https://youtu.be/5wwFTFP9ocY

Currently having to do a fish-in cycle recently started. Water temp 22c.
74 litre tank 2.6ft long.
Ammonia = 0 (doing daily 25% water changes with Seachem Prime)
Nitrite = 0
Nitrate = 0

Any help/advice would be very much appreciated.

My apologies that my reply will have to be brief:
* for now, I wouldn't worry about the white tint - the key is to keep water quality at optimum levels while you go through the fish-in cycle [but let us know if anything further develops];
* danio - will answer re that on your other post but think it's unconnected.

Many thanks for the reply, went to an aquatic shop to get a different test kit as I wasn’t convinced the one I had was much good as it shows the same result for ammonia in my fish-in cycle as it is on the smaller tank I’m doing a fishless cycle.

But ended up showing one of the people the pictures and they’ve said what you’re saying.

Very grateful for your time and help.