What types of animals/ criters will i be seeimg as tank matures

[Willyesco]

I just saw a white worm bout an inch moving across the glass, and i started to wonder what else would i be seeing as my tank matures, also having my battle with red algae..

 

[whisnantrider]

Cant help with the red algae as I have been fortunate enough to not have that problem yet, knock on wood.

As far as the critters I have tons of small sponges a few little feather dusters and some slug looking type critters. I've even had small corals pop up(white star polyps and green buttons) I guess it just depends on the rock you have.

 

[Henry405]

I have some kind of red creature under my rock, but I haven't seen it for awhile since I kinda buried the area where I saw it was at. From pictures off the internet, I believe its either a brittle starfish or brittleworm (more likely the starfish since it had single brittles out of the pores in its body, not multiple like the one's i see on brittle worms.) I did manage to pull a bit of a tentacle off, but I threw it back and I think my hermit ate it

Also heard some clicking sounds last night, but it wasnt like something hitting a rock. I did notice one of my fishes near my heater, but I dont think it was able to move the heater. Hopefully I dont have a mantis shrimp