how big will my sponges get?

[dmits41]

I just discovered about 5 tiny neon yellow sponges in my tank that are about the size of a pea. Will they get much bigger than this? Are there different types of sponges that grow different sizes or are they all pretty similar?

 

[Gary Majchrzak]

there are many different types of sponges.
They grow to huge size differences- from miniscule to larger than a human being. Certain types are photosynthetic. Most are (to some extent or another) toxic. Sponge ID is challenging- spicules are often used for positive identification.
Until your pea sized yellow sponges are properly identified I doubt anyone will know if they will grow larger. Your best bet is to provide them with a proper environment for possible growth (I'd suggest trying low light/high particulate matter/massive flow).

 

[1st timer]

I just discovered about half a dozen yellow sponge in my tank,(after plucking out about 4 cups of algae). They are ranging in size from small pea to about the size of a whopper candy (yum). I will try to get pics, but i think they are yellow ball sponge.