The water is a recipe, so leave the ingredients made up
A bumblebee goby's holiday risk begins with its water. Many of these gobies live in brackish conditions, a deliberate mix between fresh and salt that a helpful checker can ruin in one innocent top-up from the tap. Whatever your goby's established setup, the travel rule is identical: the checker adds nothing to the tank that you have not prepared and labelled in advance. Leave top-up water mixed, matched, and bottled, with a line on the brief stating that no other water, however clean it looks, goes in.
Brief them, too, that evaporation concentrates what is already there, so the marked fill line on the glass is a duty rather than a decoration. A tiny tank loses level quickly, and a goby's small world can drift further in a week of neglect than a large tank drifts in a month.
Feed the rock, not the tank
A bumblebee goby holds a small territory around a rock or shell and eats what arrives there. It does not chase food across open water, and tankmates or current will take a general feeding long before any of it settles at the goby's door. Your checker must therefore be shown, in person, exactly where to place small meaty morsels: at the territory, in small amounts, watched until taken. A goby can starve during a holiday in a tank that was fed every day, and it happens through geography, not neglect of the schedule.
Leave the food portioned and frozen or prepared in daily amounts if it takes thawed items, with strict instructions against substituting whatever is in the freezer or feeding extra dry food it will not eat. Uneaten substitute food fouls a small tank quickly, and the goby, living on the bottom, breathes the consequences first.
Small tank, close watching
The daily check for a goby is close and specific. The fish should be at or near its territory, upright, coloured in clear bands, and interested when food lands. A goby that has abandoned its rock, hangs at the surface, or lies tilted is a same-day call to you. Because the fish is tiny and the tank is small, ask the checker for a photograph with any report; your eye on an image is worth a paragraph of a novice's description.
Hands stay out of the tank. A checker tempted to rearrange a rock to see the fish better can collapse the territory the whole arrangement protects, and a goby evicted by kindness may not reclaim a spot before stress does its work. Looking is the job; the glass is not a door.
Plan bigger cover for longer trips
For more than a short trip, a goby's small, specialist setup deserves a sitter with fish experience or a temporary move of the whole small tank, water and rock together, to that person's home, planned well ahead rather than improvised. What it should never get is a holiday transfer into someone else's community tank, where the water, the competition, and the geography are all wrong at once.
On your return, test the water against your recorded values, check the goby at its rock across a feeding, and restore levels gradually if they have drifted.
Specialist details are the first thing a verbal handover loses, which is why KinsLe writes them into its Care Pass, giving your checker temporary, clear access to the goby's water recipe, feeding rock, and warning signs for the trip.