Hey guys so I have a DSM tank with Staurogyne Repens and hair grass after about a month I noticed this growth in the crack of this seiryu stone. Any idea what it is? 939821B3-90C6-48DF-B7A4-5CA41D0782E0.jpgFA92DA58-CBAA-4A73-A0D2-EACA5352B206.jpg