Mulm is the black coloured "shit" that you find inside an old filter when you open it up. They hold bacteria, and adding those to your substrate will kick start the cycling process.
After finishing the substrate setup, fill water up to half the tank and start planting. The water will help in your planting process. There is another method: you fill water up to the substrate level, then plant in low lying plants like foreground plants/moss. After that, fill up to half tank level and plant in your stemmed plants/medium height plants. After that, fill all the way and finish. Filling water should be
very gently done, especially if you used base fertiliser. If you turn on the tap too forcefully, the base fertiliser will be messed up and your tank will be a brownish mess.
Yeap, the bottled bacteria is the same as the one used for cycling new tanks, like Seachem Stability, or any of those bottles that add beneficial bacteria to your tank.
Also read up the stickies in this forum if you haven't done so like
this one. Reading more = better setup experience

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