- Joined
- Apr 19, 2017
- Messages
- 103
- Reaction score
- 50
I have a royal or halloweeen urchin. It can't keep up. I was told long spines are the most affective.
Long spine urchin kept the coraline in check years ago when I had a 120g tank. It spent probably 95% of it's time on the back and side glass because thats where it grew the most.

