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Frogspawn Coral
The frogspawn coral is most often a stony-coat type. They are widespread of the stony coats.
Description/Quick facts:
Small, low branches are typical. Stony coats are the most common type.
It can be bright green, brown, or a mixture of the two. Colours vary depending on location and lighting. When threatened or under stress, the frogspawn coral will secrete a slimy substance that looks much like frog eggs hence its name. This slime is used to repel predators. Easy to grow in captivity.
Size:
Usually, small colonies make up large colonies. It can grow to over 120 cm or 3 feet in diameter.
Lighting: Moderate lighting.
Moderate lighting is needed for its zooxanthellae to thrive, but it can grow well in low lighting if it is not deprived of light for too long. It will not lose its colour without light, but it will be white in colour without light, and the colony will die if it is kept in darkness for too long. The frogspawn coral grows best when the lights are left on 12 hours a day and not on 24 hours a day; however, they do fine with lights on 24 hours a day too.
Water Temperature: Keep between 72-78 degrees.
Feeding: The frogspawn coral feeds by piercing its tentacles through the water and emitting mucus from its gills. It can also feed on plankton and other small particles floating in the water column from the time it is small until it reaches a size where it can feed on larger food items such as mussels, copepods, shrimp, etc.
Hammer Coral
The hammer coral is also a stony-coat type and typically shares many of the same characteristics as the frogspawn coral, such as location, rainforest colouring (meaning it will be green), and some health concerns.
Description/Quick Facts:
The hammer coral is a very large polyp and can grow over 4 feet in diameter. They exist in various colours, such as purple-red, green, yellow, and blue-green. The hammer corals are considered some of the most beautiful corals on this list due to their coloration and size.
Size:
Usually large colonies. Usually make up a large colony. It can grow to over 4 feet in diameter.
Lighting:
Moderate lighting is needed for its zooxanthellae to thrive, but it can grow well in low lighting if it is not deprived of light for too long. It will not lose its colour without light, but it will be white in colour without light, and the colony will die if it is kept in darkness for too long. The hammer coral grows best when the lights are left on 12 hours a day, not 24 hours a day.
However, they do fine with lights on 24 hours a day too. Water Temperature: Keep between 72-78 degrees.
Feeding:
The hammer coral feeds by extending its tentacles into the water and funnelling plankton into its mouth. It will also feed on small organisms floating in the water column, including other corals and small shrimp or fish. It also feeds on mollusks, slugs, amphipods, copepods, and other prey items for their environment, such as bivalves.
Hammer Coral vs Frogspawn Coral
The frogspawn coral is most often confused with the growth form of a hammer coral. The hammer coral grows in clusters of slender branches which resemble a hammer. However, the frogspawn coral is more likely to grow in colonies (i.e., “clumps”) than the hammer coral. It is also more likely to have high, complex branching patterns than the hammer coral.
Euplillia
Euplillia is a type of coral. It is a stony-coat polyp found in all tropical and warm ocean environments. They are found in shallow, rocky reef environments, which makes them ideal for aquarists who want to keep corals indoors. The euplillia coral is similar to the frogspawn and hammer coral, but is longer, kinkier, and sturdier.
LPS coral
The Frogspawn and Hammer corals are examples of LPS coral species. They are characterised by their long branches that hang down from the centre of their colony. Plus, they cover much more surface area than the other types of corals. They have similar considerations as the other polyp stony types, where they like to be in shallow waters, warm water, and high-light environments.
Hammer Coral vs Frogspawn Coral: Final thoughts
Many people often confuse a Frog spawn coral with a Hammer Coral, but there are major differences between them.
A Frog spawn coral is more commonly found in the rainforest and brightly coloured than a Hammer Coral, typically found in shallow water reef environments.
Another major difference is that a Frog Spawn Coral will have “egg-like” structures protruding from its surface.
On the other hand, a Hammer Coral will have long branches that hang down from the centre of its colony and cover much more surface area than the other types of corals listed here.