mulm is some blackish stuff like dust or dirt found in your filter. Alternatively, find a friend with gravel and a cycled tank and ask him to dig a little gravel for you to put into your tank.
Anyway it is not extremely impt as your filter has some bacteria in it alrdy so i dont forsee a prob for you no worries for you then. ")
Holy is the Lord, God Almighty ! The Earth is filled with His Glory !
90 x 50 x 50 cm tank: Eheim 2217; ANS CO2 Solenoid with 60mm intense bazooka; Zetlight 6400; Teco 500 Chiller; Borneo Wild Steel inlet/outlet
Ferts: Dry Mixture/Dr Mallicks. Temp: 26 degrees Substrate: ADA Amazonia
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