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There's no need to put your gravel on top. What kind of lighting do you use? If your lighting is inadequate for plants, then they won't grow no matter what kind of substrate you use.
Unfortunately, I doubt that your bettas will coexist peacefully in the same tank.
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WE CAN STAGE A RUNAWAY GOLF CART MARATHON
8 gallon planted, 75 gallon CA/SA cichlids, 120 gallon planted, 50 gallon reef. Waiting to set up 100 gallon frag tank & 125 gallon reef.
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