Starting to take over!

[Rick76]

Over the past few weeks I have had an increasing number of these appearing... What are they?

 

[frisbee]

Harmless sponges. There also appears to be some Foraminiferans, Asterina stars and some Spaghetti worms in the pictures as well.

http://www.lionfishlair.com/hitchhiker/hitchhiker.shtml

 

[DianaKay]

Agree with @frisbee....I see nothing harmful.
All FUN TANK WATCHING!

 

[Rick76]

It's such a relief to get sound advice - thank you... With a huge sigh!
Still soooooo much to learn [emoji1]

 

[Oxylebius]

The top picture is a colonial tunicate. Filter feeder like the sponges.