Welcome to TONMO, a community of cephalopod experts, hobbyists and enthusiasts. Established in 2000, we are the founders of TONMOCON, and birthplace of World Octopus Day and Cephalopod Awareness Days. To contribute to the discussion, register here, and perhaps Introduce Yourself. To rid yourself of ads and enjoy other perks, become a Supporter for just $50/year. Follow us on Twitter and YouTube for more cephy goodness.
There are also various power head intake strainers, or you can make one yourself. Got to you LFS and browse the shelves for options. The 'filter sponges' are available there as well, and do make good protection.
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