Mary K Posted June 6, 2021 Share Posted June 6, 2021 Hi all! I am replacing my HOB with Large sponge filters on my 75. How long do I wait before I can take off my HOB. I have 2 Sponge filter in the tank for one week now. And 2 HOB's. One HOB has crushed coral, so Ill be keeping that and maybe just have one Sponge filter. Thanks for any advice! Link to comment Share on other sites More sharing options...
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