Leave or scrape old coralline alge residue?

[kj5kb]

I'm setting up a 125G that has previous coralline algae residue...maybe 5% of the back is covered. Is there any advantage to leaving it? or should I just scrape it clean?

Tank has been dry for about 6 weeks.

Thanks, Don

 

[Amphiprion]

I'd just scrape it. Why not start out clean?

 

[kj5kb]

That was my thought...but wondered if the "old stuff" was a good substrate to encourage "new stuff" Or does it matter?

not being lazy...as it seems to be quite easy to clean off.

 

[Amphiprion]

It will encourage film and microalgal growth before it encourages anything else.

 

[kj5kb]

Good point...off it comes!