I have constantly been told to have less gouramis because are aggressive, but my gouramis get on like a house on fire. It's a 70 litre tank, there is a flame red gourami, a cobalt blue gourami, an opaline I am temporarily holding 2 kissings, 2 corys and a b/n. I also have another tank with four hermit crabs who are living the life and in my 20 litre I have an awesome little fighter named Thor.