Midas Blenny

Ecsenius midas

Saltwater Fish Species Group: Blenny Family: Blenniidae

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Water parameters

Temp 76-80 F Temperature

Maintaining a stable and appropriate temperature is critical for the survival of aquatic life.

pH 7.8 - 8.4 potential of Hydrogen

Measuring the acidity or alkalinity of water on a 0–14 scale, where 7 is neutral, 7 is alkaline.

NO3 1-20 ppm Nitrate

While less toxic than ammonia, high nitrate levels (above 40–80 ppm) are important to monitor because they can cause fish stress, stunted growth, and harmful algae blooms.

NO2 <0.0001 ppm Nitrite

It is a highly toxic, intermediate compound in the nitrogen cycle produced from broken-down ammonia

PO4 0.01 - 0.1 ppm Phosphate

It is essential for plant development but must be managed, as excess levels trigger nuisance algae blooms and inhibit coral calcification.

NH3 <0.1 ppm Ammonia

It is the primary killer of aquarium fish, causing gill damage, stress, and death

Ca 380 - 450 ppm Calcium

Supporting the growth, skeletal structure, and shell formation of corals, mollusks, crustaceans, and coralline algae

KH 8 - 12 dKH Alkalinity

It acts as a shield, neutralizing acids to prevent dangerous pH "crashes" that can harm fish, corals, and plants.

Mg 1200 - 1400 ppm Magnesium

It enables coral growth by supporting skeletal formation, assists in metabolic processes, and ensures that calcium is available for corals, clams, and coralline algae.

SG 1.023 - 1.026 SG Salinity

Essential for maintaining stable, natural water parameters, proper osmoregulation, and stress-free environments for marine fish and corals

ORP 250 - 400 mV Oxidation-Reduction Potential

A higher positive mV indicates clean, oxygen-rich water with high water quality, while low readings indicate high pollution.

About Midas Blenny

General information

The Midas Blenny is a small and colorful saltwater fish species that grows up to 3 inches in length. It has a bright yellow coloration with blue and black stripes on its head and a blue-black tail. These fish are found in the Western Pacific Ocean, from Indonesia to Fiji, and are often found in coral reefs and rocky areas. They are active swimmers and can be kept in small groups in a tank of at least 20 gallons with plenty of live rock for hiding and perching.

Diet & nutrition

The Midas Blenny is an herbivore and feeds on a diet of algae, phytoplankton, and zooplankton. They should be fed small amounts of food several times a day, and a varied diet should include dried seaweed, spirulina, and other vegetable-based flakes or pellets.

Diseases

Midas Blennies are relatively hardy and not prone to many diseases. However, they can be susceptible to the usual saltwater fish diseases, such as ich, velvet, and fin rot. Good water quality, a varied diet, and a stress-free environment can help prevent diseases.

Origination

The Midas Blenny is native to the Western Pacific Ocean, from Indonesia to Fiji.

Cautions

The Midas Blenny is generally considered safe to keep in a home aquarium. However, it can become territorial towards other fish that have a similar body shape, such as other blennies, gobies, and dartfish. It is best to keep them with peaceful fish species.

Acclimation process

The Midas Blenny should be slowly acclimated to the aquarium water by floating the bag in the aquarium for 15-20 minutes, then adding a small amount of aquarium water to the bag every 5-10 minutes until the temperature and salinity of the water in the bag matches that of the aquarium. They should be released into the aquarium gently.

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