Cobalt Blue Goby
Stiphodon semoni
Cobalt Blue Goby (Stiphodon semoni) is a peaceful freshwater fish that suits calm freshwater aquariums. Its adult size of up to 5 cm should still be matched with stable water and compatible fish.
Quick facts
- Adult size
- up to 5 cm
- Aquarium size
- 45 L or larger
- Care level
- Beginner – Intermediate
- Temperament
- Peaceful
- Temperature
- 20–28 °C
- pH
- 6.5–7.5
- GH
- 2–12 dGH
- KH
- 2–6 dKH
- Diet
- Omnivore
- Lifespan
- up to 5 years
- Group behavior
- NA; 3 Females per Male
Overview
Cobalt Blue Goby (Stiphodon semoni) is a freshwater aquarium fish for aquariums where the layout leaves enough swimming room and the water stays stable.
Use these values as planning checks, then make sure the aquarium still has room for behavior, group needs, and calm community fish.
Care requirements
With a Beginner – Intermediate care level, Cobalt Blue Goby is approachable, but it still needs stable water, clean substrate, and a well-planned stocking group.
With a lifespan of up to 5 years, this is a fish to plan for long term rather than an impulse addition.
Aquarium size and space needs
An aquarium of 45 L or larger can be a reasonable starting point, but it should not be read as permission to overstock.
At up to 5 cm, Cobalt Blue Goby stays small, but it still needs room to move, feed, and avoid constant competition.
Water parameters
The temperature range for this fish is 20 to 28 °C, which fits many tropical freshwater aquariums. Choose other fish with overlapping temperature needs.
The pH range for this fish is 6.5 to 7.5. That points to slightly acidic to neutral water, but stability is more important than sudden corrections.
The GH range for this fish is 2 to 12 dGH. That gives some flexibility, but sudden changes are usually more stressful than a stable value that is slightly imperfect.
The KH range is 2 to 6 dKH. Use it as a general stability reference rather than a reason for aggressive adjustments.
Temperament and compatibility
As a peaceful fish, Cobalt Blue Goby is best kept with calm species that will not harass it or dominate the feeding area.
Feeding
As an omnivore, Cobalt Blue Goby should receive a varied diet rather than one repeated food type.
Before adding this fish
Use this checklist before treating the profile as a match for an existing aquarium.
- Plan for an aquarium of 45 L or larger.
- Choose other fish with overlapping temperature needs.
- Keep pH stable within the listed range instead of making sudden corrections.
- Avoid aggressive or highly competitive fish.
- Offer a varied diet that matches this species.
Similar fish profiles
Use these profiles to compare fish with similar care level, size, temperature range, or swimming behavior.
FAQ
How large does Cobalt Blue Goby get?
Cobalt Blue Goby reaches up to 5 cm according to this profile. It stays relatively small, but aquarium planning should still account for swimming room.
What aquarium size does Cobalt Blue Goby need?
Plan for an aquarium of 45 L or larger. Treat this as a baseline, because fish also need suitable swimming room and compatible fish.
Is Cobalt Blue Goby peaceful?
Yes. Cobalt Blue Goby is recorded as peaceful and is best planned with calm community fish that do not harass it or dominate the feeding area.
What temperature is suitable for Cobalt Blue Goby?
The temperature range for this fish is 20 to 28 °C. Choose other fish with overlapping temperature needs and avoid sudden temperature swings.