OT: Article on Hydrozoan + Coral symbiosis

[Oxylebius]

New aquarist have been trying to get rid of these for ages and now we come to find out that they help corals?

Here's a reef symbiosis you've likely never heard about. Tiny hydrozoan polyps that sit on the surfaces of stony corals can help keep corals safe from predation and infection.
http://www.advancedaquarist.com/blog/hydrozoan-coral-symbiosis

Hydrozoan polyps living on coral surface. Credit: S. Montano, Milan-Bicocca University

 

[Pat24601]

New aquarist have been trying to get rid of these for ages and now we come to find out that they help corals?

Here's a reef symbiosis you've likely never heard about. Tiny hydrozoan polyps that sit on the surfaces of stony corals can help keep corals safe from predation and infection.
http://www.advancedaquarist.com/blog/hydrozoan-coral-symbiosis

Hydrozoan polyps living on coral surface. Credit: S. Montano, Milan-Bicocca University

Neat!