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Paired with a 9+1 stainless steel HPCR bearing system and precision machined gears for effortless performance while the Carbon Matrix drag provides smooth and consistent pressure across the entire drag range

This will allow the fish to breath and stay active for longer

This rod is very close to a new rod

Crafted with precision, our braided fishing line features advanced technology that ensures maximum tensile strength, allowing you to tackle even the most challenging fishing conditions

So Id say you will be fine adding 10 more tetras, just keep up on your water changes

e360: Could you give some sense of how sharply fish populations have declined