Help IDing Clear "Tubes" Critters

[CayoHueso]

These clear "tube" critters have almost completely taken over the rear chamber of my nano AIO. They're growing and attaching themselves to the glass, heater and temp probes. I've also started to notice them growing on the rock in the tank as well. They seem to soft tissue and not hard, they also have a small flat extended base where they attach to the glass. They move with flow as well, but they are attached and stationary. I would say they are only in the dark, but I have noticed a few growing on the rocks surface in the light.

Any ideas on what they might be? TIA!

 

[Gumbies R Us]

@ISpeakForTheSeas

 

[ISpeakForTheSeas]

These clear "tube" critters have almost completely taken over the rear chamber of my nano AIO. They're growing and attaching themselves to the glass, heater and temp probes. I've also started to notice them growing on the rock in the tank as well. They seem to soft tissue and not hard, they also have a small flat extended base where they attach to the glass. They move with flow as well, but they are attached and stationary. I would say they are only in the dark, but I have noticed a few growing on the rocks surface in the light.

Any ideas on what they might be? TIA!

Those are sponges - harmless filter-feeders; just check regularly to make sure they're not growing in/clogging up your equipment/plumbing.

 

[BristleWormHater]

Those are sponges - harmless filter-feeders; just check regularly to make sure they're not growing in/clogging up your equipment/plumbing.

Beat me to it!

 

[CayoHueso]

Those are sponges - harmless filter-feeders; just check regularly to make sure they're not growing in/clogging up your equipment/plumbing.

Thanks!