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That depends on the tabs. I use SeaChem and replace them every 3 months. Several of our aquariums have BDBS. Keep the substrate under 3" to avoid anaerobic bacteria that produces hydrogen sulfide gas.spike98 said:Do the tabs need replaced occasionally or are they fairly permanent? Is it nicer if you need to relocate plants, as you won't have to worry about fert being stirred up? Sorry for all the questions I'll probably ask, just want to cover everything since I'm new to the plant scene.