Adding A Prefilter To Your Marineland HOB Filters (Original Design) Cut The Sides For a Square Shape

[@ChristianF2424]

Nice you have a great setup I’m sure your goldfish love it

[@ColossalSwordFormAndTechnique]

Yeah. They swim happily everywhere 😂 Lots of gas exchange. So they never run out of oxygen. Never come up for air

[@ColossalSwordFormAndTechnique]

This saves your HOB Filters many many months or even years worth of maintenance ☝️ Thank me later