I'm deciding between a Marineland Penguin and a Hagen Aquaclear to hang to the back, but not sure how loud and smooth the water stream is. I just got a 40g tank and the water level is around 5in below the top, so I'm guessing the water sound will be quite loud. I was hoping the output hits the water as a steady stream without splashing.
The alternative is an internal filter, a Fluval 3+.
I don't have the space for an external filter.
What do you think of these filters? Of course, better alternatives would be appreciated.


