I have one of those basic top fin silent stream filters on my 20 gallon tall right now and I don't feel like it's good enough. Not even gallons per hour or water disruption whatever. What would be something that could hang on the back and not be crazy expensive? Does anyone have experience with the UV lighted filters? I'm also wanting to buy the 9W green killing machine but have noticed some hang on back filters with the UV light integrated into them. I've had green water issues on and off for a while now, nothing has helped long term, so I'm headed to UV anyways. Thoughts on if I should have a separate filter or one with the UV in it.