ID please. Is it algae?

[RogueGrown]

This (algae?) is growing on my glass in the area about the size of a dime. It looks like it's systemic and each node has a polyp. I cannot find it anywhere else in my system so far.


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[jlmawp]

Looks like hydroids. They look like feather dusters a bit too, but the network of runners connecting them makes me think hydroid.

 

[Sk8r]

Definite. A nuisance, rarely become anything more than that, attached to rock. If it does, some kalk paste or a peroxide dip will fix it. For now, ignore it: you can do far more harm trying to wipe out what usually is no problem.

 

[RogueGrown]

Thank you!!! Being attached to the glass makes it hard to dip though. If I scrape it surly I'll have more issues. Being a "nuisance" does that mean it can be dangerous or pose a threat to surrounding occupants?


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[AlSimmons]

They should be fairly easy to siphon out. Just use the edge of the hose to knock them loose.