AQUANEAT Aquarium Bio Corner Sponge Filter, for Breeding Shrimp Nano Fish Tank, up to 10Gal

AQUANEAT Aquarium Bio Corner Sponge Filter, for Breeding Shrimp Nano Fish Tank, up to 10Gal

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whatisakafka posted on r/bettafish2w

https://www.amazon.com/dp/B078X7H8XG I have one of these in my 5 gallon shallow tank. You might want two instead, in opposing corners, to get more movement across the surface to combat biofilm buildup