just found this in my tank. it wasnt moving while in the tank, or when i took it out. this is the second type of this that i have found. not sure what they are, but they are roundish, not flat. i got a picture as zoomed in as possible.
not that i noticed. i picked it out with tweezers. didnt seem to react at all. it does have a similar look to a pineapple, so maybe. i pulled it out just in case. and with a name, i did a search online, and it does have a similar look to one, so i feel that your assumption is probably correctAny pics of it in water? What was the behavior like?
I’m thinking a sponge, probably pineapple.