What is this?
- Thread starter HAAAAAAAA
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BristleWormHater
Valuable Member
They look like bryozoans to me
BristleWormHater
Valuable Member
Looks like some kind of bulga species maybe flabellata or neritina. I don't if they will stay or not. @ISpeakForTheSeas can help from here.
OP, any chance you can get closer pics of it?
My first thought would be a sponge of some kind, but I can't tell for sure.
Odd way to check would be to poke it - if it's squishy, it's a sponge; if it's solid, it's not.
Some sponges are photosynthetic in addition to being filter-feeders, but all sponges filter-feed on Dissolved Organic Carbon and Particulate Organic Carbon (basically just super tiny pieces of organic things) - so they'll eat bacteria, small phytoplankton species, viruses, etc. It's not generally stuff that's easy to provide, but we can do things to try and help them along (my first post in the first link basically provides the short version):
For keeping sponges, I'd suggest reading through the following threads (and any links to other threads in my posts in them):
Sponge Tank
Does anyone have experience keeping a sponge only aquarium? If so where can I purchase sponges. I've only found a few online.www.reef2reef.com
How hard/easy to grow sponge?
I want to be able to grow sponge for my angelfish. Could I do it in a tank I grow macro algae. It's very nutrient rich water, it's my molly breeding tank. Macro algae grows well in the tank with no doesing. The mollies keep it prestienly clean of unwanted algae and only nip here and there on the...Is This Ball Sponge a Goner?
Hi all! First of all, I know the typical spiel - sponges are nearly impossible to keep and feed. Despite this, at the end of December I decided to try one. I feed phyto daily and blast it with frozen food juices and kick up microfauna in the sand for it but not sure it’s enough. I had it...
OP
OP
HAAAAAAAA
Well-Known Member
It is indeed squishy! Whilest i was moving the rocks around i touched it by accident Lol, it doesn't seem to be as red as when I first got it and seems to be enlarging it's so called dots is this normal?
If it's losing color/browning, then it may be a photosynthetic species that needs more/less light for its symbionts, but it should be able to survive without the symbionts in case they die off.
Yeah, sponges have two kinds of "dots" on them - the ostia (the small, in-current holes; singular = ostium) and the oscula (the big, out-current holes; singular = osculum). Depending on how the specific kind of sponge grows, the oscula at least may grow as the sponge does up to a certain size; additionally, some sponges can expand and contract a bit, which may change the size of the holes for a time too.
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