Oh thats pretty, 125 gallon wow, wish I could! Wormis in there..so its a garden soil substrate? I used miracle gro organic and garden sand. Was a big mess until massive water changes, then after a few days it cleared but I was thinking big boo boo at the time lol Worms..I thought worms needed access to air and would die being submereged..like garden worms? Ottos, can`t wait for algae..my fav tiny fish.