Never ever seen this algae before!

[Dburr1014]

What is this?
Grew in about a week in my sump. I say about because I've been kinda busy lately with other things going on. A week is probably the last time I was in my sump.

The sump has a frag rack so a light does come on every night.
This was found at/near the surface of the water.

It's hollow, that is strange to me. It's also paper thin,i can't believe it grew this large in a week or possibly me not noticing it last week. This stuck out like a soar thumb yesterday. It also came off the Rubbermaid tub easily.

 

[edsbeaker]

Looks like a Godzilla size Bubble Algae.

 

[Dburr1014]

Looks like a Godzilla size Bubble Algae.

It does, but it's empty. Just air in the cavity. Well, water until I picked it up.

 

[Crabs McJones]

Oyster thief algae

 

[Dburr1014]

Oyster thief algae

Yes, thank you.
Colpomenia peregrina

 

[JGT]

Stuff like this is always intriguing to me. Since it’s new and never been seen before, where did it come from? Coulda been introduced on a frag I guess, but would think would have seen even a small remnant of it. And if nothing new introduced, why now did it decide to grow to such a large piece?

 

[Dburr1014]

Stuff like this is always intriguing to me. Since it’s new and never been seen before, where did it come from? Coulda been introduced on a frag I guess, but would think would have seen even a small remnant of it. And if nothing new introduced, why now did it decide to grow to such a large piece?

Very good questions.

My last frags came from Groton Marine Science high school. That was December.

It was a scary and intriguing moment.

 

[stevelee]

What is this?
Grew in about a week in my sump. I say about because I've been kinda busy lately with other things going on. A week is probably the last time I was in my sump.

The sump has a frag rack so a light does come on every night.
This was found at/near the surface of the water.

It's hollow, that is strange to me. It's also paper thin,i can't believe it grew this large in a week or possibly me not noticing it last week. This stuck out like a soar thumb yesterday. It also came off the Rubbermaid tub easily.

for more check at https://zoroto.watch/

You’ve found a type of marine sponge or macroalgae. Both can grow quickly in nutrient-rich, lit environments like your sump. The hollow, paper-thin structure and rapid growth are typical of these organisms. Since it came off the Rubbermaid tub easily, it’s likely a harmless growth, but if unwanted, you can remove it.