another help ID'ing

[edress714]

 

 

 

[khh27]

Sponges looks like.

[Oxy]

Looks to be a colonial tunicate. Tunicates can sometimes be difficult to distinguish from sponges. In general, sponges feel “spongy” – compressing and then springing back when touched, while tunicates tend to resist compression. Colonial tunicates generally are slick and shiny while the surface of sponges is usually dull or porous. Perhaps this can help you to ID it.

 

Either way, both sponges and tunicates are good filter feeders. Many won't survive in low nutrient tanks. If you would like to keep them alive, provide filter feeding foods a couple of times weekly and watch your water parameters at first to make sure your tank can handle the extra feedings. Target feeding at first can also help keep them alive.