HELP TO CLASSIFY!

Emily

I took stones from the last batch, and this wonder was sitting in them! What is it, and how harmless is it? I wonder how big it grows.

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.