Internal Corner Filter

i've never used them, but i totally would for a small fry tank or quarantine tank. I'd just be put off by taking it out all the time to clean it.

Looks like a great idea and I might just do that for my tank I just set up for breeding


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it's the same principle as a sponge filter but a little bit more annoying to clean, honestly i would just get a sponge filter.

I have used those, just the same principle as a box filter except layered...they work fine. They are a pain to clean, I honestly never clean them, but I just use them for fry, quarantine, hospital, grow out tanks and such.

If you don't plan on using chemical media, I'd say go with a sponge filter since it's so much easier to clean. It will provide mechanical and biological filtration, probably just as well if not better than this corner filter.