Disalvo's goby

Where they come from

Disalvo's goby (Kelloggella disalvoi) is one of those tiny, easily-overlooked reef gobies that lives tucked into rubble and little crevices on Indo-Pacific style reefs. Think shallow reef slopes and broken coral zones where there are a million hiding spots and a constant drizzle of tiny prey floating by.

In the tank, that background matters because they are not a "bold open water" fish. If you build them a micro-habitat, you will actually see them. If you do not, they turn into a myth.

Setting up their tank

This is an expert fish mostly because of feeding and shipping stress, not because it wants weird water numbers. You want a stable reef tank with lots of texture: rubble, small caves, overhangs, and tight cracks. They pick a home and run a little circuit from it.

• Tank size: you can keep one in a nano, but bigger is easier because stability and pod production go way up. I like 20+ gallons for breathing room.
• Aquascape: a rubble zone or a small pile of broken coral skeleton is gold. Make at least 3-5 tiny bolt-holes that a fish the size of your fingernail can vanish into.
• Flow: moderate, not blasting their favorite perch. Give them calmer pockets behind rockwork where food can settle and they can hover.
• Lighting: whatever the reef runs. They do not care, but they do care about feeling exposed, so provide shaded spots.
• Cover: tight lid. These little gobies can and will jump if spooked, especially in the first week.

For acclimation, I go slow and low-stress: dim the lights, drip acclimate, and get it into a pre-planned hide immediately. If you are a "rearrange rock later" person, do it before the fish arrives. They do not love having their home bulldozed.

What to feed them

Feeding is the whole game with Kelloggella. They are micro-predators that want tiny moving foods, often multiple times a day. If they are eating well, they are surprisingly hardy. If they are not, they fade fast.

• Best starters: live baby brine shrimp (enriched), live copepods, live rotifers if you have them.
• Frozen that usually works: cyclops, calanus (chopped if needed), finely chopped mysis, fish roe, small plankton blends.
• Prepared: some will learn pellets, but do not buy one expecting that. If it happens, it is a bonus.

I watch the belly, not the calendar. A healthy Disalvo's goby should look slightly rounded in the abdomen after meals, not pinched. New imports often need smaller feedings 2-4 times a day until they settle in.

How they behave and who they get along with

These are shy, perch-and-dart gobies. They spend a lot of time hovering a centimeter off a rock, then snapping at specks in the water. Once comfortable, they get a little bolder and you will see their personality.

• Good tankmates: small peaceful fish that will not outcompete them at feeding time (small gobies, firefish that are not bullies, tiny assessors, gentle blennies).
• Use caution: wrasses, dottybacks, hawkfish, big clowns, and anything that treats tiny fish like snacks or treats feeding time like a contact sport.
• Inverts: generally fine with shrimp and crabs, but a large aggressive shrimp can steal every bite you offer them.

Territory-wise, they are usually chill, but in a small tank two similar tiny gobies can bicker if they want the same crack in the rock. More hiding spots fixes most of that.

Breeding tips

Breeding is possible but not casual. Like a lot of small reef gobies, they are cave or crevice spawners, and the male typically guards the eggs. The hard part is raising the larvae, not getting the spawn.

• Give them a nest option: tiny caves, short pieces of small PVC tucked into rock, or narrow shells/crevices.
• Condition with food: frequent small meaty foods and live options. A well-fed pair acts more confident and stays visible longer.
• If they spawn: expect tiny larvae that need rotifers and/or very small copepod nauplii, plus stable greenwater-style feeding routines.

Common problems to watch for

• Slow starvation: the number one issue. They may look fine for a week, then you notice the belly pinching in. Increase feeding frequency and use smaller foods.
• Getting outcompeted: they are not built for chaotic feeding frenzies. Target feed and give them quiet zones.
• Shipping stress and refusal to eat: common early on. Dim lighting, lots of cover, and live foods usually turn the corner.
• Jumping: especially right after introduction or if chased. A tight lid is not optional.
• Disease sensitivity: tiny fish go downhill fast with ich/velvet. Quarantine is smart, but set up QT so they still feel secure (a little rock substitute and some fake crevices).

If you nail two things - lots of tiny hiding places and a steady supply of small meaty foods - Disalvo's goby goes from "invisible expert fish" to a really rewarding little reef character. It is just not forgiving if you try to keep it like a generic community goby.