I have literally 7 of these and will probably add more. Although I have other forms of filtration in my fish/axolotl tanks, I prefer sponge filters because they keep the tank clean. They also move easily to fit the QT tank. I also only recently discovered that I can put crushed coral in containers. I usually have lava in it, but I also have low pH from the tap, but my canister filters don't have room for crushed coral, so they save space too.
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