Critter ID please

Shawsy81 · Jul 3, 2020

I started a macro algae tank and my glass is full of these critters some sort of sea slug or nudibranch?

tsouth · Jul 3, 2020

These look closer in resemblance to flatworms. Can you tell us where you received this macro from? If it's purely a macro algae tank - then need no fear, probably a great species for these tanks tbh!

Shawsy81 · Jul 3, 2020

tsouth said:
These look closer in resemblance to flatworms. Can you tell us where you received this macro from? If it's purely a macro algae tank - then need no fear, probably a great species for these tanks tbh!

The macro is from a seller long ago I got 2inches and now have 2 main growths about 10inches in diameter lots of leaves etc I put 1 in a separate tank with some calerpa and red algae grass to grow out with some rock etc so nothing new so I don't get where these worms come from?

tsouth · Jul 3, 2020

They may have hitched a ride back in the day, and have now grown to large proportions. All it takes is one with these and it becomes a thriving population.