I purchased a used tank from a friend of mine. He had the water drained out for a couple days before I picked it up. I decided when I got home to try to save the live sand and rock by mixing up some water and getting everything running. When I woke up in the morning the green coraline algae was starting to come back but I also found these on the substrate and on a few of the shells.
Can anyone tell me what they are and more importantly, are they good or bad because they seem to be multiplying like rabbits!
Can anyone tell me what they are and more importantly, are they good or bad because they seem to be multiplying like rabbits!