I have used internal filters and they are very scarce. I changed them and it improved a bit. I found these filters recommended to me by my favorite fisherman on YouTube and tried one of them. Now all my tanks use them. My shrimp love them. The fins of my tail are safe. My triplets climb it. Even snails and crabs. I used shrimp bio medium and charcoal for a South American aquarium. Both media work great with these filters.
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