Hello Crew, I have a seven gallon FW tank that is well planted and contains two Gouramis (one Gold, one Opaline) <... need more room than this> and three Albino Cory Catfish. I’m not sure of the filtration rate but the water seems to pump though fairly smartly. Ammonia is zero, Nitrites are zero but I have not tested for Nitrate. When I first got this tank, as a first time fish keeper, I sought extensive advice from the LFS. They assured me that this size tank was fine for this setup and actually suggested I get several more fish. Having done some reading I now realize that this tank is far too small, so the obvious option is a bigger tank. However, my two Gouramis currently get along fine. I suspect they are both females as they both have dorsal fins that are of an elongated oval shape and not pointed. They do chase each other very occasionally but most of the time they swim together and hang out together peacefully. I suspect that the small size of the tank