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Emily
Tricia7885
This is a nudibranch, catch it and flush it down the toilet.
Even if it is herbivorous, when scared it releases toxins into the water, slowly poisoning the aquarium.
John828
It is definitely poisonous! There are both poisonous and non-poisonous nudibranchs! It's a shame to throw it away! An unusual creature! By the way, I recently had almost all my fish die, but I thought it was the sea apple that released toxins, or could this thing have done it too?
Timothy
Could
Useful nudibranchs are much smaller
There was a website about all useful and harmful creatures, I can't find it, if I find it, I'll post it.
Cindy
Thank you, I will be waiting!
Gabrielle5053
Also, some unknown creatures crawled out from under the stones!!!!
Luis3725
You can classify your mollusks at this link! I also have one that is only black in color!
Emily3144
Thank you very much!!!! Very good resource!!!!
Michelle5859
Just in case you haven't figured it out yet, in your photos, the snail is Stomatella, which is very useful, feeds on algae, reproduces in the aquarium, but is very defenseless; it can easily be eaten by hermit crabs, mantises, and even large shrimp...
Mariah
Recently in the sandbox, after turning on the light, I found about 5-6 of these little worms. After the light was turned on, they hid in the sand, and only thin "antennae" are sticking out. What kind of creatures are these?
Meghan
This is a cirratulid. A harmless little worm that eats detritus.