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Hydroids ARTICLE

Hydroids

Hydroids are stinging colonial polyps that hitchhike into reef tanks and can spread across plugs, racks, and rockwork. They often irritate corals and cause...

Reefapedia 4 min read
Myrionema Hydroids ARTICLE

Myrionema Hydroids

Myrionema hydroids are stinging colonial polyps that often spread around zoa mats and frag plugs, causing localized zoanthid irritation and persistent closure. They thrive...

Reefapedia 4 min read
Christmas-Tree Hydroid ARTICLE

Christmas-Tree Hydroid

Fire/Christmas-tree hydroids are stinging Pennaria colonies that look like tiny feathery “mini trees” on plugs, racks, and sump/overflow surfaces. They can irritate corals—and sting...

Reefapedia 4 min read
Collector Urchin ARTICLE

Collector Urchin

Collector urchins are effective algae grazers with a lot of personality, but they’re mechanically disruptive by nature. They’re reef safe biologically, yet will pick...

Reefapedia 4 min read
Tuxedo Urchin ARTICLE

Tuxedo Urchin

Tuxedo urchins are small, reef-friendly algae grazers that excel at controlling film algae and biofilm in mixed reefs. They’re generally gentle, but will move...

Reefapedia 4 min read
Pistol Shrimp ARTICLE

Pistol Shrimp

Pistol shrimp are burrowing engineers that reshape the sandbed, move rubble, and make their presence known with characteristic snapping. They aren’t cleanup crew and...

Reefapedia 5 min read
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