A friend brought us an Opaline Gourami for the future community tank, but the tank is not completely ready yet. We put the Gourami temporarily into the Goldfish tank, and he was agressive towards the Goldfish, tearing the fins and even some scales. I had to remove him and put him into a smaller tank with just a sponge filter in it. Since Gourami breathes the same as Betta will he be okay in this tank until the big tank is ready? Are Blue and Opaline Gouramis too agresive for a semi-agressive community tank?