R raggie New member Aug 29, 2008 #1 ok so the tank has been running for about 7 months now and i just got back from vacation and found dark Grey and green layer on my sand any ideas?
ok so the tank has been running for about 7 months now and i just got back from vacation and found dark Grey and green layer on my sand any ideas?
abulgin Premium Member Aug 29, 2008 #2 A picture would help. My guess it's cyanobacteria but no way to tell without seeing a picture.
