nanshaw2001
Older newbie
I recently completely tore down and rebulit my tank about a month or so ago. Sand bed is at about 4 inches and this is in my 150 tall. Previously there had been some dead areas but I rinsed the sand thoroughly several times (6-8) and added new sand as well. I now have 3 small hills about an inch that are dark grey but no where near black. Should I gently disturb these areas? Any input appreciated!:strange: