first, do a water change. if the fish are gasping at the surface it could very well be a CO2 issue instead of an oxygen issue,
second, what is the temp of the tank?
third what type of flow do you have in the tank? what type of filtration?
third, if the fish are having serious issues (cannot tell from your description) increase surface agitation. gas exchange primarily occurs at the surface level. **** little oxygen is exchanged as bubbles rise to the top of the tank. given your description, and iff you have an airstone with pump handy, let the airstone float near the surface of the tank. will do a lot more for you that way.
fourth, if the fish asre in desparate straights you can also gently cup the fish in your hands and gently drag them backwards through the tank. it forces water over the gill membrane. sort of like mouth-to-mouth for fish.
good luck.
ps. i promise not to answer the phone anymore when typing a response. so many snuck in--lol.
second, what is the temp of the tank?
third what type of flow do you have in the tank? what type of filtration?
third, if the fish are having serious issues (cannot tell from your description) increase surface agitation. gas exchange primarily occurs at the surface level. **** little oxygen is exchanged as bubbles rise to the top of the tank. given your description, and iff you have an airstone with pump handy, let the airstone float near the surface of the tank. will do a lot more for you that way.
fourth, if the fish asre in desparate straights you can also gently cup the fish in your hands and gently drag them backwards through the tank. it forces water over the gill membrane. sort of like mouth-to-mouth for fish.
good luck.
ps. i promise not to answer the phone anymore when typing a response. so many snuck in--lol.