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Sponge Filter, 20 Long


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I would say two (one in each corner) is probably better, but (always that word) I don't run two sponge filters in any of my 20's.

Two sponges would theoretically create less dead spots, would allow you to rotate cleaning filters, leave you with a "spare" cycled sponge to swap into a new or hospital tank. There are a ton of benefits. 

But I don't do it because I only have so many sponge filters, only so many air drops, etc.

So while awesome in a lot of ways, not so awesome that I feel it is critical to do so. I keep 3-4 "spare" sponge filters in a 40B with my shellies so already have that part covered and the circulation difference isn't a big enough deal to me to lose any sleep over.

My 2 cents,

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92730357-A07C-4657-93CC-A2D131DB10F6.jpeg.6f4a1cf2e88d0a47dca160b1d944077b.jpegI run two filters in my 20L but only 1 of them is a sponge the other is a Penguin 175 pro hob. I like having the hob for mechanical/polishing filtration. The combination provides good flow throughout the tank and very clear water. 

Edited by Paul
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