Start with the feeding question, because bettas are overfed
Start by asking a sitter exactly how they will feed your betta, because overfeeding is the most common sitter mistake with this fish. A betta's stomach is tiny, it will beg convincingly at the glass, and a generous sitter can foul a small tank in days. Ask whether they are willing to give only the portion you have measured out, at the times you set, and to skip a feed rather than double one up if they miss a slot. Show them the amount in person, ideally pre-portioned, and ask them to promise that nobody else in the household will add a casual extra pinch for the friendly fish.
Ask about heat, because a betta is a tropical fish
Ask whether the sitter will check your betta's heater and thermometer every visit. A betta kept in a heated tank can decline quietly if a heater fails or gets unplugged during cleaning, and the change is easy to miss because the water still looks clear. Agree what reading counts as normal for your tank, what to do if the temperature has clearly dropped, and whether the sitter is comfortable topping up evaporated water with treated water you leave ready. Also ask where the tank will sit in their routine if the betta stays in your home, since a tank moved into a cold hallway or a sunny window changes the picture completely.
Ask about the lid, the light, and other animals
Ask a betta sitter about the lid and the light, because both are daily safety points. Bettas jump, especially when startled, so the lid must go straight back on after every feed, with no gap left for cables to excuse. Ask how they will handle the light schedule, whether by timer or by hand, and whether cats or dogs in the home can reach the tank or knock its cover. If children will be nearby, ask who supervises them around the tank. A sitter who treats these questions as sensible rather than fussy is the sitter a solitary, territorial betta needs.
Ask what they will do if the betta looks wrong
Ask what the sitter will do if your betta stops eating, builds no interest in food, or spends the day lying on the bottom or clamped at the surface. You are not asking them to diagnose anything, only to notice a change from the normal behaviour you describe and to contact you the same day rather than waiting until you return. Agree the order of contacts: you first, then your chosen aquatic shop or vet if you cannot be reached, and leave those numbers written down. Ask if they are willing to send a short daily photo, because a picture of the betta's posture and fins tells you more than a cheerful text saying all is well.
Ask about experience, and be honest about yours
Ask whether the sitter has actually kept a betta or another lone tropical fish before. General pet experience helps, but a betta is not a small goldfish: it lives alone, dislikes strong flow and tankmates appearing in its space, and needs warm, calm water. Be honest in return about your fish's quirks, such as flaring at a particular object or refusing one food shape, so the sitter is not alarmed by normal behaviour. Once you have chosen, handing over through KinsLe with Care Pass lets the sitter see the betta's routine and key details clearly for exactly the days you are away.