Yellow Cusk Eel
Diancistrus fuscus
| Stock | Variations | Price | Quantity |
|---|
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Monday – Friday 8 AM – 9 PM
Saturday 12 PM – 4 PM
Sunday 12 PM – 9 PM
Healthy, stable animals from vetted suppliers — inspected before packing, shipped overnight. Decades of experience built this model so we can deliver premium livestock at 30%+ less than you'd pay elsewhere.
| Care Level | Moderate |
|---|---|
| Temperament | Peaceful |
| Reef Safe | With Caution |
| Functional Benefit | Ornamental Only |
| Diet Type | Carnivore |
| Mininum Tank Size | 30 gallons |
| Max Size | 3 inches |
| Temperature | 72–78°F |
| pH Range | 8.1–8.4 |
| Specific Gravity | 1.022–1.025 |
The Yellow Cusk Eel (Diancistrus fuscus) is a small, eel-shaped brotulid often sold under names like “yellow cusk eel,” “yellow brotulid,” or “yellow eel goby.” It typically settles into the rockwork and uses tight crevices as a daytime home base, showing more of its movement when the tank is calm.
What You’ll Observe:
- Gliding, eel-like movement along the rock and under ledges, especially later in the day
- A strong preference for a favorite “den,” with occasional moves to a new cave
- Quick, direct feeding strikes once it learns where food appears
- Long stretches where it stays out of sight inside the aquascape
Provide a rockscape with multiple small caves and shaded overhangs so it can choose a secure resting spot. Offer small meaty foods like mysis and finely chopped seafood, and use a pipette/target-feeding near its hiding area to build a consistent feeding routine. In mixed tanks, it does best when it can eat without competing with fast, aggressive feeders.
Is it normal for this fish to “disappear” for weeks (or longer)?
Yes—many keepers report that yellow brotulids/cusk eels spend most of their time inside the rockwork and may only show briefly, often when the tank is quiet.
What’s the best way to get it eating consistently?
A predictable schedule helps. Target-feed small meaty items (like mysis) near its den, and many hobbyists start with foods it recognizes readily before transitioning to a broader frozen diet.
Why is it sometimes sold as a “yellow eel goby”?
In hobby discussions, this fish is frequently traded under multiple common names, and “yellow eel goby” is a common mislabel despite it not being a true goby.
Will it bother very small fish or tiny shrimp that sleep in the rocks?
Most of its time is spent in caves, but hobbyists commonly plan tankmates around the idea that anything very small and rock-sleeping can be viewed as potential prey.
How can I confirm it’s doing well if I rarely see it?
Many owners look for consistent feeding response when food is placed near its den and watch for subtle signs like a head peeking out at low-light times.
We work with trusted suppliers who keep our specimens healthy and well-fed before shipping.
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