Don't want to hijack the thread but does anyone have an issue with such dramatic swings in pH for long shipped fish?
I have a maintenance business and regularly ship fish from California and overseas for clients. From Cali they usually only spend 12-18 hours bagged, but from Indonesia or Fiji it is at least 24 hours. That long in the bag and the pH is generally at 6.4 or less. Good thing is ammonia is all inert but I am always worried that that big of a pH shift will be a problem. I have been using a heavy drip acclimation process over 4 hours to bring back up and adding ammo-lock to be sure ammonia doesn't shift and cause issues.
Is there a better way. I acclimate from 50 to 500+ fish at a time depending on what is coming in a from where. Overseas orders only make sense with large numbers of small to medium sized fish, otherwise the shipping is so high per fish that it's better to buy from a US supplier. Last week I acclimated 100 dwarf angels, 200 firefish, 80 PJ cardinals, 30 butterflies (saddles, longnose, and falcula), 40 sailfin tangs, 10 naso tangs, 50 green chromis, 20 yellow head sleeper gobies, and a harlequin tusk with only 7 total fish lost from shipping and acclimation. Too many to quarantine separately so they all went into the 6000 artificial reef and we just quarantined them in the DT. The chloroquine kills the algae on the structure anyways which is a great bonus and prazi doesn't cause any negatives so no real issue with doing it that way. The only negative is that difficult to feed species can some times be out competed by the current inhabitants, so we tend to quarantine them separately, same with weak looking fish. But if you are fat and look strong after acclimation then straight into the display. I dose chloroquine at 10mg/l and prazi at 2.5 mg/l. Chloroquine is bumped to 15mg/l if any sign of issues after the first few days. UV and ozone turned off, skimmer turned way down because otherwise the diatom die off causes overproduction and loses of 500 gallons or more of water which makes the sump run dry.