Small white branch looking things

[Garcia2460]

Hey everyone.. started to notice these small white growths on the back wall of my tank near my slimmer as well as on my power head I have some pictures.. not sure what these are. Can anyone help?
Thanks

 

[TheGreatBarrioReef]

Pods? Nudis? Do they move around the tank?

 

[ISpeakForTheSeas]

In both cases, these are sponges - as long as they’re not smothering corals or clogging equipment, they’re harmless filter feeders.

 

[ISpeakForTheSeas]

Well that sucks. I started the tank with dead rock, and haven’t added anything but a couple of quarantined fish.

Again, they're not really something to worry about - in fact, many people consider sponges a sign of a healthy ecosystem in the tank; I just list those potential concerns to watch out for because there are a few rare cases of sponges getting into people's tanks and causing problems (these are very rare cases though).