Let's get scientific
This may sound ludicrous to you but I managed to observe a most interesting Opae Ula behaviour.
In my cylindrical tank my Opae can swim laps without having to take turns. So I had some months to watch them and I noticed that when they're swimming in a swarm like mode (not in grazing mode but really on the move in a swarm) they almost 100% of the time swim in counterclockwise direction.
Please tell me if you are noticing this in you tank too
Please choose according to your location - Northern Hemisphere or Southern Hemisphere


This may sound ludicrous to you but I managed to observe a most interesting Opae Ula behaviour.
In my cylindrical tank my Opae can swim laps without having to take turns. So I had some months to watch them and I noticed that when they're swimming in a swarm like mode (not in grazing mode but really on the move in a swarm) they almost 100% of the time swim in counterclockwise direction.
Please tell me if you are noticing this in you tank too

Please choose according to your location - Northern Hemisphere or Southern Hemisphere

Last edited by Algae In Space on 23 Jan 2019 17:22, edited 4 times in total.