Co2 Diffuser Reccomendations
Don't have a spare, but have had good luck with the atomic diffuser. Only downside is that it requires 30psi and won't work with DIY co2, or with a low-pressure regulator.
Not fragile like glass diffusers and reasonably unassuming in the tank.
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Eheim Pimp Club member #414, 2076 Pro 3e