What in the world is this?

[Stavrozo]

Hello R2R community

Well i have a tank that is 5 months old and its doing pretty good.....inside i have 2 clownfish and 1 coral beauty and 1 foxface rabbitfish with one rbta and 2 live rocks (one added recently from an old system i had a year ago) anyways now out if the blue i noticed some things on my tank glass please helo me identify it.... Small things all over this side of the tank and moving.... And this i found few of it its so small though abd tiny... So what in the world is this... Please tell me ita harmless i asked my lfs and he said its probably a baby anemone so ineed your help friends and yes its a fish only tank with live rocks.... And i have led lights for now

 

[Caseyoidae]

Looks like aptasia

 

[Sharkbait19]

Looks like hydroids, fairly common in new tanks.

 

[Stavrozo]

Looks like aptasia

I hope not, i need to make sure so i can make the right decision

 

[Stavrozo]

Looks like hydroids, fairly common in new tanks.

What is this.... Are they safe?

 

[Sharkbait19]

Hydroids are a type of cnidarian, often found in colonies. Some can be bad, but the types found in early tanks are usually harmless and go away soon.

 

[Eagle_Steve]

Hello R2R community

Well i have a tank that is 5 months old and its doing pretty good.....inside i have 2 clownfish and 1 coral beauty and 1 foxface rabbitfish with one rbta and 2 live rocks (one added recently from an old system i had a year ago) anyways now out if the blue i noticed some things on my tank glass please helo me identify it.... Small things all over this side of the tank and moving.... And this i found few of it its so small though abd tiny... So what in the world is this... Please tell me ita harmless i asked my lfs and he said its probably a baby anemone so ineed your help friends and yes its a fish only tank with live rocks.... And i have led lights for now

Looks like a hydroid in the medusa stage. Being as you can see it from different angles, give the below a quick google search and compare.

If it is one, then I would not worry about it. They are common in new setups and usually die off once other microfauna establishes.

Google this:

hydroid medusa stage