Another unexpected guest

[legazya]

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Any idea about this small, round. white thing, of about 1 cm diameter?

 

[ddelozier]

walking Sponge. It will spread out those long feelers, and move by attaching them and pull itself along till it finds a spot where its happy.

 

[legazya]

Yes!!!, that is. Thank you Devin, for your quick and accurate answer. After a little research, I see it is Tethya wilhelma, and that it is a pretty interesting animal (Movement without Muscles). But, any trouble with it in the aquarium?

 

[ddelozier]

not unless you have stuff in the aquariums that eats sponges.