What are these?

Levinson

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I have a ton of these tiny dots on the tank glass. They seem to be stuck to the glass, don't move about and more on the area with less light. I don't even know if these things are alive or even an animal, algae or something else.
Does anyone have any idea what they might be?

Next to a copepod.
20-12-16 15_27_53.png


A crappy photo. I swear it looked better when I took it.
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From distance. I used a LED light so I can capture it on camera and show how many there are.
IMG_20201219_210708.jpg


A video clip
 

RedFrog211

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Interesting.. I’m guessing it’s a type of hydroid, but that’s a very loose guess. Did they show up out of nowhere? How old is your tank?
 

RedFrog211

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Almost resembles a freshwater hydra— obviously minus the tendrils
 

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Levinson

Levinson

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Interesting.. I’m guessing it’s a type of hydroid, but that’s a very loose guess. Did they show up out of nowhere? How old is your tank?
Well, there weren't as many when I first noticed them. They gradually increased their numbers.
My tank is only about 3~4 months old.

Did they occur all at once.? Odd shape. Maybe sponge or could something have spawned?
At first, I thought it might be something left behind by other critters like remains of hatched eggshells or something. But now I don't think that's the case, there are far too many of them.

Almost resembles a freshwater hydra— obviously minus the tendrils
I hope not.

It may be irrelevant but my copepod population have gone down quite a bit recently and I started to find some collonista snails, maybe these things have something to do with it?
If they are snail eggs, that won't be very pleasant with so many of them.
 
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RedFrog211

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I’d remove them. Best case scenario, they’re snail eggs; but like you said, you wouldn’t want that many. Other possibilities include cniderians (my guess is hydrazoa), which could irritate corals; or they're sponges, which you won’t particularly regret removing. I’d scrub them off with a toothbrush while siphoning to prevent them from spreading— Maybe keep a couple in a separate container to see if they hatch!
 
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