What Are these in my 40 Gallon?

[joemonkaquat]

Would appreciate any help in identifying these. Should I be concerned?

 

[Dburr1014]

Zoas and pineapple sponges.
Both are a great find.

 

[joemonkaquat]

Zoas and pineapple sponges.
Both are a great find.

The zoas were intentional. Not sure these are sponges considering they're constantly moving throughout the tank, although a picture doesn't demonstrate that. They seem like an invertebrate and are more active with the lights off

 

[Dburr1014]

The zoas were intentional. Not sure these are sponges considering they're constantly moving throughout the tank, although a picture doesn't demonstrate that. They seem like an invertebrate and are more active with the lights off

Oh, they move. Looking again I'd say chittens.

Snail Focus: Chitons – First Time Fish Keeper

Identifying the species of Chiton is essential to know if it is reef safe or not, but it is only a very small minority of Chitons that are predatory. You would have to be VERY unlucky to end up with a predatory species in your aquarium.

firsttimemarinekeeper.com

 

[OrionN]

Those are isopod hitch hiker. They will multiply a lot but will get wipe out by the fish later on. Very good herbivore.
Here a post of @Lionfish Lair regarding this beneficial isopod

There are a lot of different isopods besides two. There has to be some confusion here. The two types that are similar in appearance, but not function, are the Cirolanids and the Sphaeromatid. When you learn what they look like, even they are easy to tell apart. The eyes are the give away for me, upon visual inspection. The cirolanids even look evil. In 20 years, I've never had a hitchhiker cirolanids or sphaeromatid, that's how uncommon they are. Now, I've had some shipped to me to watch them and photograph them, as I've kept tanks just for hitchhiker's alone.


These are some of the sphaeromatid I have had....

This is a male

Female

This is how they got the nickname Roly Poly. Only they can do this, the "evil" ones cannot.

Next to my hand for size reference

 

[joemonkaquat]

Those are isopod hitch hiker. They will multiply a lot but will get wipe out by the fish later on. Very good herbivore.
Here a post of @Lionfish Lair regarding this beneficial isopod

I'd have to agree with that, appreciate everyone's assistance

 

[OrionN]

here they are wipe out a bunch of algae in my new tank over several days. I had many thousands of them in my new tank. Never bother a thing other than algae.

 

[olonmv]

They look like stomatella snails. Good CUC.