Can someone please let me know why all of my fish are swimming at the top of the tank.
Hope someone has some answers as we have lost 4 fish in the last 3 days, but have only just noticed the swimming at the top.
this may not be connected.
thanks in advance
I know this is a lot to ask but we really do need the information to give you an intelligent answer. In the meantime, I would do a large (75% water change) and start an airstone and airpump. This will at least take care of the two main possible problems for a day. (ammonia poisoning in an uncycled tank and oxygen starvation). Also the temperature of the tank should be about 80 degrees for the health of the fish.
That's generally a good indicator there's not enough oxygen in the water.. either you don't have enough air going into the tank ( in which case you can adjust the airflow higher) or your air-pump is too small for the size of tank you have (in which case a bigger air-pump will be needed).. either way, it's a problem you'll have to deal with sooner than later to ensure healthy fish.