Trying to decide between the Marineland 5 gallon and the Tetra crescent 5 gallon since both are on sale at petco. I have a 5 gallon rectangle tank but just hate the look of another rectangle tank (since I have a 10 gallon and 20 long). So which is a better tank overall? I like the looks of the marineland better and it is about $10 cheaper. But I know and like the filter in the tetra tank. But what does the back of the marineland corner tank look like? Is it still curved or does it come to a point? Thanks!