Are they really bad for the tank, or just bad for the appearance?
I ask because I use an HOB
on my tank, along with a power head and a skimmer.
The outlet of the HOB
is coevered in algae, every few weeks I wipe it off and throw the algae away, and it regrows of course,
But I am wondering, is this really a bad thing? at the least, I think it keeps the algae from growing IN the tank (I have no algae problems inside the actual tank)
I know that in freshwater, algae can be beneficial by removing excess nutrients from the water. Even in a planted tank it can be beneficial as long as it is not growing on the plants (plants tend to take first dibs on all teh nutrients, the algae sucks up any extras, but the plants always outcompete the algae)