Discus reward preparation and punish impulse buying, so the questions you ask a fish shop before getting a discus should focus on water match, feeding history, and sourcing. A good shop answers all three without hesitation, and its answers tell you whether its discus will settle into your aquarium or spend their first weeks stressed by a sudden change in conditions.
What water are the shop's discus living in right now?
Discus in a shop should be kept warm, usually in the low-to-mid eighties Fahrenheit, in soft, slightly acidic water, so ask for the actual temperature, pH, and hardness of the sale tank rather than a general care-sheet answer. Then compare those numbers honestly with your own tap or prepared water at home. A discus moved from warm, soft shop water into cool, hard home water faces an adjustment that shows up as darkened color, clamped fins, and refused food. Ask, too, whether the shop adjusts its water or keeps discus in local tap water, because locally kept fish often transition to a local home far more smoothly. If the numbers differ sharply from yours, the real question becomes whether you are set up to reproduce the shop's water with every water change, not just on day one.
How long have these discus been here, and what are they eating?
A discus that has been in the shop for several weeks, eating in front of staff, is a far safer purchase than one unpacked days ago, so ask how long the group has been on sale and request a feeding demonstration if possible. Ask exactly which foods the fish take — frozen mixes, pellets, or live foods — so you can stock the same food before the fish come home and avoid a hunger strike during the move. Healthy discus watch people, hold their fins open, and come forward at feeding time. Fish that hide at the back, breathe fast, or show stringy pale waste are telling you to wait, whatever the discount. Asking about appetite is really asking the shop to show you the fish's current health rather than describe it.
Where did the discus come from, and what size are they?
Discus sourcing shapes hardiness, so ask whether the fish were bred locally, bred elsewhere in the country, or imported, and how large they currently are. Small juvenile discus need frequent feeding and very clean water to grow evenly, while larger, older juveniles cost more but forgive beginner mistakes more readily. Ask what size the shop expects them to reach and what group size suits your tank, because discus are social fish that settle best in a group of their own kind rather than as a single showpiece. A shop that steers a first-time keeper toward a bigger group and a bigger tank, even at the cost of a smaller sale today, is giving you the advice that keeps discus alive.
Will the shop hold fish, and what happens if one fades?
Discus purchases go better with a pause built in, so ask whether the shop will hold a chosen group for a few days while you finish preparing the tank, and what its policy is if a fish stops eating shortly after purchase. Reputable shops quarantine new stock and will tell you plainly if a system is being treated. Ask whether they will test a sample of your tank water before the sale, too — many good shops will.
Walking in with these questions turns a discus purchase from a gamble into a match between the fish's current life and the one you can offer, and KinsLe's Pet Services Directory helps you find local fish shops whose honest answers and healthy stock make that match easier to judge.