Assorted Reef Hermit Crabs

How to Care for Assorted Reef Hermit Crabs

written by Dave Burr

Reef Hermit Crabs are superb algae eaters, they will even eat filamentous algae and cyanobacteria. It is very useful in keeping reef aquariums clean and free of undesirable algae.

Growth: As Reef Hermit Crabs grow they will need larger shells to take the place of the shells they outgrow. Place several old snail shells in the aquarium where the Reef Hermit Crabs can get to them when the time comes to move to a larger shell.

Feeding: If no algae is present in the aquarium you may supplement the Reef Hermit Crabs' diet with live macro algae, dried seaweed (nori), and mysis shrimp.

Tip: Don't forget about your water parameters when combating algae blooms. Water chemistry is every bit as important as a good clean-up crew.

Care Level: Easy
Reef Compatible: Yes
Diet: Herbivore, Omnivore
Range: Indo-Pacific
Family: Diogenidae
Water Conditions: 75-80° F; sg 1.024-1.026 (1.025 is ideal); pH 8.1-8.4 Ca 420-440 ppm, Alk 8-9.5 dKH, Mg 1260-1350, Nitrates <10ppm, Phosphates < .10ppm

Water Chemistry: It is important that proper calcium (420-440 ppm), alkalinity (8-9.5 dkh - run it 7-8 if you are carbon dosing) , and magnesium levels (1260-1350 ppm) are maintained. Raising magnesium levels gradually up to 1400-1600 ppm can help to combat algae outbreaks, just keep CA and Alk in line as you raise the Mg. Nitrates should be below 10 ppm and phosphates should be below .10 ppm. We recommend doing a water change when Nitrate levels rise to 10 ppm. It is important to replace your phosphate media when phosphates rise to .10 ppm. Media Reactors make the most efficient use of your phosphate media by fluidizing it.

Dosing: Vivid Aquariums uses and recommends dosing pumps to automate the dosing of additives and keep your levels more constant. A dosing pump can alleviate the chore of manually dosing your aquarium with Ca, Alk, & Mg 2,3, or 4 times per week and will benefit your aquarium by keeping your levels constant through frequent small additions of Ca, Alk, & Mg. Our tanks all progressed when we switched from 3 manual dosings per week to 70 automatic dosings per week and we got a lot more work done.