Scats are the garbage cans of the BW world, like goldfish & Oscars. They eat a lot (like lots of vegatable matter but will eat whatever you throw at them) & poop tons! They need a very large tank, as they will grow the size of a dinner plate & lots of dilution for all that waste. They also prefer marine conditions as adults.
Why is there no substrate or decor in that tank? What are your plans for these fish?