Electric Blue Jack Dempseys

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Basic Handling

A minimum of a 40 gallon aquarium is suggested, though a larger tank is recommended if keeping them in a semi-aggressive community tank with other like sized fish. The fish need adequate water movement combined with strong and efficient filtration. Although Dempseys can tolerate a fairly wide range of conditions, warmer temperatures have shown to lead to more aggression in this fish. Many aquarists will keep the maximum aquarium temperature below 78° F (26° C) to help reduce aggressive behavior. Provide a bottom of fine sand and plenty of hiding places among rocks and wood. Plants are appreciated but should be hardy, such as Sagittaria. Place the plants around the inside perimeter leaving an open area in the center for swimming. The plants should also be potted to protect the roots.

Minimum Tank Size: 40 gal (151 L)
Substrate Type: Sand
Lighting Needs: Moderate – normal lighting
Temperature: 72.0 to 86.0° F (22.2 to 30.0° C)
Breeding Temperature: 86.0° F
Range ph: 6.5-7.0
Hardness Range: 8 – 12 dGH
Brackish: Sometimes
Water Movement: Moderate
Water Region: All

Have a Question?

The Electric Blue Jack Dempsey is a rewarding specimen for the aquarist as it is moderately easy to keep as long as the aquarium is maintained. If you have any questions, please call or email us, and we would be happy to assist you!

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Water Temperature

One of the easiest ways to reduce aquarium mortalities is to maintain ideal water conditions. Make sure your aquarium has all of the appropriate water parameters and environmental requirements for the particular species you are interested in keeping. While most aquarium species can adapt to or tolerate a broad range of water parameters, keep in mind that certain delicate species of fish, plants, corals and invertebrates have very specific water parameter requirements. Please review each individual species description for specific information.

The water temperature of your aquarium plays a vital role in the health of your fish. Fish are very sensitive to temperature changes and any sudden temperature change can wreak havoc on your fish. Invest in a reliable heater to maintain stable water temperature. For reef aquariums illuminated by metal halide light fixtures, the use of a chiller is recommended since many corals are sensitive to high water temperatures. Without the aid of an efficient aquarium chiller, decline in coral health or even coral loss may result.

dKH (degree of carbonate hardness also known alkalinity): Carbonate hardness is the measure of carbonate and bicarbonate concentration in your aquarium water. Alkalinity plays a vital role in stabilizing and buffering aquarium pH. This parameter is very important to monitor in coral reef systems since alkalinity and calcium have a unique relationship where the concentration of one affects the other. For example, if aquarium alkalinity is too high, then calcium levels tend to fall as calcium precipitates out of solution. Conversely, if the calcium level is too high (over 500 ppm), then there is a tendency for alkalinity to drop.

pH (potentia hydrogenii or the power of hydrogen): Measurement of relative alkalinity or acidity. A pH reading of 7.0 is considered neutral, with readings higher than 7.0 (up to 14) being alkaline and readings lower than 7.0, acidic. 
Specific Gravity: Specific gravity or “sg” measures the relative salinity (amount of dissolved salts) in your aquarium water in comparison to pure water. Measuring specific gravity on a regular basis is crucial to maintain the ideal environment for your marine inhabitants.