Originally Posted by fisherson
i'll be doing a water change in a day or 2 it'll all suck up in a syphon..what causes it in the first place?
many different things.... even if you suck it up, it will come back..... check the list below for some possible causes:
-old bulbs
-poor water conditions
-over feeding
-tank right in a window
-ect.
The first two are the biggest, and the third is often a cause of the second.