Tara Posted June 21, 2021 Share Posted June 21, 2021 I'm wanting to purchase sponge filters with air stones for my 75g Betta community as well as my 20g betta tank I already have HOB so the sponge filter will just be an additional filter for over filtration and surface agitation as well as Oxygenation, will I need 2 Med size for my 75g or will 1 be enough since I already have 2 HOB in that 2 tank? It is HEAVILY planted Thank you so much for any advice Tara Link to comment Share on other sites More sharing options...
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