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Hawkfish
The predatory hawkfish are so called because of their habit of swooping down from the above on their victims, similar to the birds of prey.
Long pectoral fins enable these fish to rest securely on a rocky perch, so that although they may sway in the current, they will not be swept away by the swell. This is important as they lack a swim bladder, so they find it difficult in maintaining their buoyancy in the water.
Gobies
Gobies are the largest and adaptable group of fish species that can be found in marine, freshwater and brackish waters in both tropical and temperate regions. Gobies number some 267 genera and 2,100 described species with many more to come. All but about 200 are marine; mostly tropical and subtropical reef.
The small size of most of the species and the fact they are relatively easy to keep makes them idea for a home aquarium, where some species have successfully breed. Males often guard the eggs, which maybe laid in crevices of rocks, and the young rapidly grow.
Most species live in, on, or near the bottom and are of small size. One super goby species attains a gargantuan eighteen inches, but almost all his kin are less than four inches in total length. The family contains the world’s smallest fishes and vertebrate. Trimmatom nanus of the Indian Ocean females reach a mere 8-10 mm.
There are other goby species only slightly larger. Many of the gobies live in close association with invertebrates such as sponges, shrimps and sea urchins; regardless of goby size, they become the center pieces of an aquarium when maintained with them.
Due to their size Goby are bite sized candy bars to many fishes like Triggerfish, large angelfish, basses… most anything with a big enough mouth will suck them down.
Many species of gobies are naturally short lived so its recommended to start out with young individuals.
Butterfly fish
The elegant swimming motion of these fishes has been likened to the flight of butterflies fluttering in the garden. Butterfly fish tend to be brightly coloured, making them very popular as a marine fish in an aquarium.
Some species that subsist entirely on coral polyps in the wild are difficult to switch to a substitute diets. Good water parameters (quality) is absolutely vital when keeping any butterflyfish, since they will readily show signs of illness if the pH starts to fall, long before other fish sharing the same tank suffer.
Gramma and Pygmy Basslets
Not only do these ranks as some of the most beautifully coloured marine fish, but their small size means they can be accommodated easily, furthermore, successfully aquarium breeding is becoming more frequent, but compatibility can be a serious issue in smaller tanks, because these fish can be territorial by nature.
Members from the Gramma and Pygmy Basslets species can be incorporated into an invertebrate aquarium set up. Rockwork with suitable retreats must be included into your tank as this matches the natural reef network they live in.
Sea Anemones
Sea anemones are typically the first thing that attracts people to reef aquariums, not to mention there relationship that some species have with anemonefish. Whats an Anemonefish you maybe asking, you may know it as “Nemo” or “clownfish“.
However only 10 species are known to host the clownfish and compared to the other within the anemone family they can hard to maintain. Most of the anomones found in your local fish shop will contain photosynthetic algae and they will require high levels of aquarium lighting and excellent aquarium water quality.
The sea anemones stinging tentacles are capable of ensaring food particles, so most species benefit from regular feeding, remember that they have the ability to move around the aquarium and this may affect other fishes or invertebrates within the aqaurium. In stable conditions the anemones will remain in the same position for many years.
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