I ordered a 5-10 gallon small sponge for my 5 gallon feeder. I use it in combination with a back strap to keep the water clear. I'm impressed with the price and build quality to be honest, but as they say it's not rated for more than 5 gallons. This thing is small, and I mean very small. Ideal for only 1-5 gallons. My guess is that if you add along with a hanging rear filter, both can handle 10 gallons, maybe more, but it all depends on your bioburden.
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