Algae

[Leslieb]

Can anyone tell me if this 1 st picture is diatoms on back glass an if 2nd an third picture of my filter has corraline or what

 

[redsea]

Hmm, I don't seem to see a picture...

 

[JumperAlex]

If good coralline algae is growing on my live rocks and I see the same purpleish algae growing on the glass, is it the same benifical algae or should I keep cleaning it?

 

[Chromediggity]

It sounds like coralline and it's purely an ascetic choice. If it's on the rear of the tank and not blocking your view I prefer to leave it.