WIll that fit in the rear chamber? I am not too fond of Rios mainly because I have heard many stories of them going bad. It says that it runs on 27 watts.... that will undoubtedly have some impact on the temp, probably not too bad though. Personally, I would look into the MJ1200. It doesnt have quite the same flow (295gph), but it is much more reliable, a little cooler at 20 watts, and a little smaller too.
Jesse