Hey. I've been planning a new tank for a while (I probably won't be able to get it until June, but a girl can dream) and I recently considerd the idea of creating an Australian biotype. I never thought of it until recently, seeing as all of the most populare tropical fish come from africa or south america, making an australian biotype rather difficult to source. Recently I came upon this site which has flipped that preconception upside down. I've fallen in love with empire gudgeons, but information on their care is hard to find. Most sources claim that they are a fresh water species, while others say that they are brackish, and more still keep saying that they can be either. ARG! Could someone give me a straight answer as to what water conditions they would require? And if they are brackish, is the purple spotted gudgeon a brackish fish also? And finally, what amount of water would they require to be comfortable, and at what population density? I found one source that claimed 15 gallons would be enough, but that doesn't seem right to me.