Cost is only part of it for me. What it does and how loud it does it matters too. I'm also fussy about how anything in my tank looks. I've had amazing luck with my tunze 6105 which are still going strong in my old 404. Still silent too. My mp10 are still running perfectly too with minimal maintenance.
I've got a Hagen 402 still doing grunt work for me as well but it's not pretty. Hence behind the scenes grunt work I guess lol.
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