Fish Food Face Posted January 29, 2021 Share Posted January 29, 2021 I saw Tazawa Tanks double stacking coop sponge filters. Can someone please tell me the proper placement of the airstone when doing this? Thanks! Link to comment Share on other sites More sharing options...
Garren Posted January 31, 2021 Share Posted January 31, 2021 I have double stacked filters before and just put the air stone no further than a inch down. 1 Link to comment Share on other sites More sharing options...
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