Rust or Diatoms on My Hydor Koralia 1

[fellbeast]

It looks like diatoms ro brown algae to me, but a friend of mine thought it was rust, and was asking me about it. Now i'm questioning it. It right on top where the shaft meets the plastic. It' pretty much on the plastic though.

[itzclayyo]

pics is the only way it could be told, i doubt its rust though.... how old is it? koralias can get built up with diatoms

[fellbeast]

It's not even a month old.. to me under the lights rust would be orangish, this is brownish. I'm at work now, but I can take a pic when I get home. I don't think it is, but I just would rather be safe than sorry. Would rust have adverse effects if it was?

[itzclayyo]

not sure how rust would effect the tank but im sure it would, copper levels, magnesium maybe, all kinds of things. see if you can just rub it off, if you can its diatoms

[fellbeast]

It's on the plastic grille, it's gotta be diatoms.. I can't see rust attaching to plastic opposite of the flow.

[Mischeif Nite]

I've seen the same thing on my Koralia Nano.....some kind of pest algae....diatoms, cyano, etc......it rubs right off or your cuc will get there eventually.

[thapatient]

happens to mine too, it's just diatoms or some other algae, comes right off.

[stanlalee]

mine accumulates diatoms on the shaft and propeller from time to time. just wipes right off.

[fellbeast]

I did just that! Thanks everyone!

[tcreefr]

I've plucked a Trochus from its spot a few times and put it on my Koralia - cleaned it right up. Now they go there on their own for regular spit shines!