What algae appears first when scrubber starts to weaken?

[iggy]

I realize this is an open ended question, and will vary in each tank, but I would like to know from people running a scrubber awhile.

Thanks

[SantaMonica]

More often cleaning glass, from the nutrients in the water.

Diatoms on plastic parts, from the nutrients in the water.

Won't appear on rocks right away, though, because the P is absorbed into them.

[iggy]

My experience has been diatoms, but my tank experiences a lot of flow, an active decorator goby that tunnels, and a strong medium sized clam.

Curious if others have seen something else...