What is that!! A R2R guide to common new tank hitchhikers.

[ShirLow]

Anyone know What this is, does not move at all just grows slowly.

 

[KJ]

Anyone know What this is, does not move at all just grows slowly.

Sponge!

 

[Crabs McJones]

Thank you KJ!

 

[Lexie217]

So idk where this thing came from but I'm kinda concerned since I don't have a clue as to what it is. Can someone please help? I recently got a mandarin goby and started hatching brine shrimp to feed him and this thing started getting bigger fast. I think it may be eating the brine shrimp too.

 

[nsteinca]

Any idea what this little crab is? Came in on an acropora frag (so assuming not safe). It’s in a 1/2 teaspoon spoon for size reference.

 

[KJ]

Any idea what this little crab is? Came in on an acropora frag (so assuming not safe). It’s in a 1/2 teaspoon spoon for size reference.

Tetralia nigrolimeata commensal with acropora sp. Nothing too worry about reef safe.

 

[KJ]

So idk where this thing came from but I'm kinda concerned since I don't have a clue as to what it is. Can someone please help? I recently got a mandarin goby and started hatching brine shrimp to feed him and this thing started getting bigger fast. I think it may be eating the brine shrimp too.

Aiptasia pest anemone remove them!

 

[Lexie217]

Aiptasia pest anemone remove them!

I did. I couldn't let it stay. It was eating away at my nerves and I couldn't stop worrying about it. I figured my peace of mind was more important and besides its better to be safe rather than sorry.

 

[Ramberto777]

I dont have a pic of it but every now and then i see a dark blue worm around a cm wriggling around my tank. Thing will go through the water column. Any guesses

 

[ssunthar]

Any idea what this little crab is? Came in on an acropora frag (so assuming not safe). It’s in a 1/2 teaspoon spoon for size reference.

A gorgeous looking crab..

 

[KJ]

I dont have a pic of it but every now and then i see a dark blue worm around a cm wriggling around my tank. Thing will go through the water column. Any guesses

Epitoke.

 

[slowleak]

Found this guy on a new Trochus snail addition. After a quick google search I think it’s a tube worm (Serpula columbiana)? It’s coming out of a tube and has a tiny nem-like tentacles. Thoughts...good...bad?

 

[FortLivingRoom]

Hi everyone, sorry pic isn’t more zoomed in but what do you think these could be?

 

[thecouch]

Can anyone help me Id these. I think there the same thing. One is on rock in shade area towards front. The other is on back of tank and seems to have a fan/net

 

[Mattyreefs]

What is this liverock hitchhiker? Closes inward when poked but doesn't fully retract. Feels kind of soft and can be pushed around unlike something like vermetid tube.

 

[KJ]

Can anyone help me Id these. I think there the same thing. One is on rock in shade area towards front. The other is on back of tank and seems to have a fan/net

Feather duster.

 

[KJ]

What is this liverock hitchhiker? Closes inward when poked but doesn't fully retract. Feels kind of soft and can be pushed around unlike something like vermetid tube.

Hard to tell from the pic.

 

[KJ]

Hi everyone, sorry pic isn’t more zoomed in but what do you think these could be?

Sponge.

 

[FortLivingRoom]

Sponge.

I did another dip the other day and scraped them off. They had a hard shell.

 

[PacsAdmin77]

I’m finally joining this band-wagon. I found this small white worm crawling on my glass this morning with lights fully on. Someone posted earlier that it might be a planarian flatworm. Can anyone confirm its ID, and, more importantly, is it friend or foe?