Tropicalfishkeeping201 Posted April 9 Share Posted April 9 Hello fishkeepers, I will be setting up my first 7 gallon blackwater cube tank for my one betta. I wanted to know if you can use Aquarium soil or organic potting mix soil topped with a thin layer of sand in a Blackwater tank or should sand only be used? I heard something about that gasses can build up in the substrate so I want to make sure I create a safe environment and not cause any issues for my betta. Thank you in advance Link to comment Share on other sites More sharing options...
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