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It’s stationaryIs it moving around the tank or is it stationary?
Hmm, I don't really know then, the pictures aren't that great, I have to go to work, but I will think about it during the day.It’s stationary
Thanks, even with the magnifying glass that’s the best I can get. It seems to be a blob with long tentacles? Sticking out of it that have little round bits mid tentacle. Here’s a very crude sketchHmm, I don't really know then, the pictures aren't that great, I have to go to work, but I will think about it during the day.
I do hope so, closest thing I’ve found so far is pineapple sponge but it’s not quite rightAppears to be a sponge.
If not it’s a tunicate.. harmless either way.I do hope so, closest thing I’ve found so far is pineapple sponge but it’s not quite right
It is tucked around the back in a low flow spotWhen they're in low-no flow environments I've noticed they develop spines (upper center, circled in red)
Looks like a Tethya species to me:Appears to be a sponge.
Looks like it may be Tethya gracilis - it should be a harmless filter feeder.
They're not super well known (they were discovered first in a German aquarium), but the study I've found describing them was very informative (linked below).
They grow up to ~1.5cm (though they can contract to be ~80% of their max body size); they can slowly move/"walk" - reportedly, they can move several centimeters a day (especially when smaller), and they do this to remove/shake off sediment that gets on them; and they reproduce by budding (so they'll drop pieces that grow into new sponges).
Now that you mention it you're probably right, the flesh texture looked alittle off to meLooks like a Tethya species to me: