It's not that 1.022 is low for a system; i don't personally see a problem with that. The problem I see is that if a coral (or anything really) comes from the majority of the stores who keep their water at 1.025 (notice i said "most" this time
) it has to very quickly adapt to 1.022... essentially its getting the salts sucked out of it by osmosis. Even with proper acclimation for hours, I don't know... but hey, that might not even be *the* problem.