Sponge Filters are the BEST
There are two reasons for this article.
First, I use sponge filters in all my tanks and I’m not ashamed. They’re soft on fish bodies, easy to clean, effective, and they won’t even suck up fish babies, water clarity is GREAT and they Bioseed overnight (If you have a donor system). No moving parts. Every once in a while you have to take them out and clean the sponge, and replace the air stone, if you use an airstone in them, at all.
The second reason for this article is that at the time of it’s publication, I found these monstrous 8x8x8″ 250-gallon size sponge filters at TEN BUCKS on Amazon, while literally EVERYONE else sells them for $23 to $25 each. I bought a dozen when I saw this. I don’t know if, by the time you read this, whether they’ll still be $10.