Start with where the danios came from
Ask first whether a shop's celestial pearl danios are tank-bred or wild-caught, and how long this particular group has been in the store. Tank-bred fish usually arrive already used to aquarium foods and local water, while wild-caught fish may need more settling and closer watching. A group that has been feeding in the shop for a while is a safer buy than fish that arrived that week. Ask which tank they are held in so you can look at the whole group, not just the individual netted for you, because the health of tankmates tells you a great deal about the fish you are taking home.
Ask about group size and tank fit
Ask how many celestial pearl danios the shop recommends taking together, and be wary of an answer that treats them as solitary fish. These are shy, social danios that colour up and feed confidently only in a proper group, and a good shop will say so plainly. Ask what tank size and layout their display group lives in, including how much planting it has, since heavy cover is what lets this species behave naturally. Ask about suitable companions too, because celestial pearl danios are easily outcompeted by pushy fish at feeding time. A shop that steers you away from boisterous tankmates is giving you honest guidance.
Ask about the water they are living in now
Ask what temperature and water conditions the shop keeps its celestial pearl danios in today. These danios come from cool, clear, heavily vegetated water and generally do best without tropical heat pushing their metabolism, so a shop running them very warm is worth questioning. Ask whether they are kept in soft or hard water locally, because matching your home tank roughly to the shop's conditions makes the move far less stressful. Ask how the shop acclimates new arrivals, since careful shops drip-acclimate delicate small fish. Write the answers down in the shop rather than trusting memory on the drive home.
Ask what the fish are eating
Ask what the celestial pearl danios are actually eating in the store, and ask to see them feed if the timing allows. A group that rushes tiny foods is showing you both health and appetite, while fish that ignore food deserve a second visit instead. These danios have small mouths and need fine foods, so ask which sizes the shop uses and whether the fish take prepared food or rely on live items. Ask how often the group is fed, because that rhythm is what you will continue at home for the first weeks. Sunken bellies in the display tank are a reason to wait.
Ask about health checks and returns
Ask what the shop does when a group of celestial pearl danios arrives unwell, and what its policy is if a fish fades in the first days at home. A trustworthy shop quarantines new stock, will happily let you reserve fish and collect them after they have settled, and will not pressure you to take pale or hiding individuals today. Ask whether males and females can be selected, since a mixed group behaves and colours best. Whatever you learn, keep it with the fish from the start, because through KinsLe a Transferrable Profiles record can move this danio's history, records, and routines intact to a new owner if its home ever changes.