Hey how do you add in water with air line or small cups..I don't really know what to tell you. It's a gamble with any fish, tig or not, especially in your case, since, if I understood it right, in one day all tigs at that LFS will be sold; hence, if one wanted a tig, they would have to take risks. IME, I don't find tigs to be sensitive. But I have been told of some bad tig shipments, where most or all would perish shortly after arrival.
Properly packed fish under oxygen is usually good for 48 hours.
The way I see it, there are pros and cons to leaving the tig at the LFS for a day. One con is that the fish will need to acclimate to a new water and tank twice, instead of once, and in short succession. Stress tends to build up.
I am not quite certain what Moe and Ron are saying. That the temp acclimation is all that's needed / reasonable? No need to gradually acclimate to pH, hardness, etc.? Why do people drip acclimate?
I am not criticizing but looking to learn. My default acclimation method is empty the water and fish from a bag into a bucket. Add water from tank stepwise until the water in the bucket is 75%-90% tank water. Sometimes I do it in 3 steps over a 20-30 min. It could take as many as 10 steps and 1-2 hours. Depends on fish, the temp difference, etc.
I'd like to read more on this because I don't get it. The water in the shipping bag is under almost pure oxygen.
So if I float the fish 20-30mins in water..add fish with tank water to bucket with ammonia detox add cup of water every 10 minutes until 80% full then slowly put the fish in.