Parameter diffrence between my breeding tanks and the LPS

Hey guy's I was hoping someone could help me with this, I supply angel fish to a number of lps, my fish are in perfect condition as I package them. But I get two different results between shops.. At some the fish do very well and at others they start dying off.. They don't die from disease but stress.. Any breeders? Well anyone? Any idea's how I can prevent this?

 

Are the lps's acclimatising their new fishes? Maybe they are not feeding correctly or not enough filters. It's hard when it comes to lps problems.

 

The do acclimate the fish,, I was thinking it could be a ph difference,, is there maybe a good anti stress medication I could package them with?

 

seachem stressguard

 

Maybe take some test kits with and ask if you can test their water. Test for ammonia, nitrite and pH at least.

We had the same problem at one stage when we were supplying koi to local pet shops. We received complaints from a specific shop that we are selling them sick fish after they had lost fish several times. We knew our fish were healthy and the other shops had no problems. We went to test their water to see what could be wrong and it turned out that their ammonia levels were sky high.