Hey Acuraman, I have that same skimmer in my 29 gal. Eclipse system (same height as your 25 gal.) It does fit, but yes, it looks ugly as hell inside the tank. Also, in order for it not to stick above the hood, you must place it lower in the water than recomended in the instructions, therefore affecting its already poor performance. Mine doesn't skim very well (or maybe I'm such an awesome fish keeper that my tank has barely any waste
)but it's better than nothing and it's all you can put in there and still retain the clean Eclipse look.
As for me, I wish I hadn't bought that damn Eclipse. It's almost impossible to upgarde without sacrificing its looks, which is the point of the Eclipse. And if you do modify it, it'll end up looking much worse than any other hood. I just bought a nice pine hood and stand. I'm going to butcher the Eclipse hood, keep just the filtration/bio wheel section, and attach it to the pine hood. Then I'll put an overflow box with a sump and move the skimmer to the sump.