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Aiptasia ARTICLE

Aiptasia

Aiptasia are fast-spreading pest anemones that hitchhike into reef tanks and sting corals. Catch and control them early—once established, they’re difficult to eradicate.

Reefapedia 4 min read
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
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
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