Getting back into it after being out for a few, I just got a 50 gallon (36x18x18) and am going to have a 20 gallon sump. Now I cannot get a lock in what stocking I want, I see brackish I want brackish (GSP) I see salt I want salt, I see fresh I want fresh. All I do know 100% is no reef, and no planted. Other than that I’m open. I would like an interesting tank with color and movement. Any ideas ??