What type of gouramis do you have??

Did you change anything about the tank? Water...new rocks...new heater or filter?
Are there any other fish with the Gouramis? Has their behavior changed?

-andy

Nothing has changed. I have one three-spotted gourami and one golden. I also have 4 discus ,3 mollies and a suckerfish. They have always done this since the beginning. But seem to be doing it more lately. Other than that, they seem fine swimming and eating fine. What could this be?

They are anabatoids - that means they can breathe atmospheric air. Are you leaving some airspace between the water surface and the glass cover?

Are they fighting? Golds are pretty aggressive. Do you know the sex of the fish?

I cant tell the sex.. Ive been trying to figure it out. I THINK that they are both male though. And actually it is the three-spotted one that is chasing the golden. There is some space between the glass and water, should it be a certain distance? Mabey I have the water too close. I know they breathe air.. but I never know they could come out that far.

I'm not certain if you've had these gouramis since they were small... and now they're just coming into maturation and thus more aggressive behavior. Sounds like they're dueling it out.

Some gouramis are definitely more aggressive than others. Mine are pretty peaceful, but they really tear into any live plants I may have.

Some ARE sexually dimorphic. Like I can tell the difference with my pearls. Search through the web - sometimes its a matter of the difference in the ventral or dorsal fins.

With blues and golds it's the shape of the dorsal fin. The males is more pointed and longer the females are more rounded..It's easy to find pics if you need them just search for sexing gouramis..

Adrea