Jaynewfishfan
Aquarium Advice Newbie
- Joined
- Dec 25, 2020
- Messages
- 6
Hello. My danios are all swimming at the surface of the tank - this is new behaviour and I’m worried for their health!
The 145 litre aquarium is 6 weeks old, we had only 10x danios (5x zebra and 5x pearl) during that period.
The water was tested at the water garden centre (where we bought the fish) and deemed good enough to introduce our other fish from an older, much smaller tank.
I introduced 5x cardinals, 1x sucker, 2x small frogs and 1x snail, all seemed good for 2 days.
I had the water retested, which showed I needed to add Denitrol to assist the bacteria growth, otherwise the water condition was perfect.
BUT
As soon as I added the Denitrol (2 hours after adding Biotopol, as directed) the danios ALL started to swim at the surface, and have not left it since. I have also noticed a slight greasy film on the surface of the water.
Post-Google/Wikipedia searching, I have introduced an aerator to break the surface tension, in case there is an oxygen shortage. But the other fish are all at the bottom where they have always been, without problem.
Does anyone have any idea what could be wrong, either regarding the fish swimming at the surface or the cause of the greasy film?
Really appreciate your help, thanks.
The 145 litre aquarium is 6 weeks old, we had only 10x danios (5x zebra and 5x pearl) during that period.
The water was tested at the water garden centre (where we bought the fish) and deemed good enough to introduce our other fish from an older, much smaller tank.
I introduced 5x cardinals, 1x sucker, 2x small frogs and 1x snail, all seemed good for 2 days.
I had the water retested, which showed I needed to add Denitrol to assist the bacteria growth, otherwise the water condition was perfect.
BUT
As soon as I added the Denitrol (2 hours after adding Biotopol, as directed) the danios ALL started to swim at the surface, and have not left it since. I have also noticed a slight greasy film on the surface of the water.
Post-Google/Wikipedia searching, I have introduced an aerator to break the surface tension, in case there is an oxygen shortage. But the other fish are all at the bottom where they have always been, without problem.
Does anyone have any idea what could be wrong, either regarding the fish swimming at the surface or the cause of the greasy film?
Really appreciate your help, thanks.