Algae , Sponge, something else?

[Ron Reefman]

I love that thing and would put 47 of them in my tank. I sent the picture to my diver, best friend in Key Largo to see if he finds them. :p

Paul, if he finds any, please let me know. And I'll post here if I find any.

So if I were to find some, would that give me the inside track to some kind of discount on a 'steampunk' fixture you could make? I love the pieces you've made that I've seen.

 

[Chela101]

20180811_142928 by Ron Lindensmith, on Flickr

20180811_143001 by Ron Lindensmith, on Flickr

I found a small one of these in my shallow reef tank a couple of years ago and assumed it was a sponge. It didn't grow, but it didn't shrink and go away like most sponges do in aquariums. But after about 4 months it just disappeared?

As some of you know, I snorkel a lot in the Florida Keys (link to a thread about snorkeling and collecting is in my signature below). BTW, lots of photos and location help. Two weeks ago we (my wife and I) were snorkeling in the Keys and I collected a couple of sponges. The purple one and the orange one started to deteriorate in my holding tank, but this green ball has survived and seems to be doing OK.

Can anybody ID it? The one I found in my tank was so small it was hard to tell what it was. I thought at the time that it was a sponge. Although this one doesn't look at all like a sponge to me. There are no big exhale holes. And what about those spikes?

I know this post is old BUT!!! I have the same thing which appeared out of nowhere. Never introduce a sponge in my stuff unless by corals but I don’t have any corals in my sump. But nevertheless I have a mini one next to the tube worm it’s small and round and spiky

 

[majano lover]

hay if you would be willing to give up some of those majanos then i would love some!

 

[Subsea]

I know this post is old BUT!!! I have the same thing which appeared out of nowhere. Never introduce a sponge in my stuff unless by corals but I don’t have any corals in my sump. But nevertheless I have a mini one next to the tube worm it’s small and round and spiky

Not likely to be a sponge with spikes like that.

If you have live rock from ocean or another mature reef tank, then potential to bring in invertebrate larvae is high.

When I first got Florida diver collected live rock, one piece took a full year to develop a gorgonion & open brain coral.