If I'm moving fish any distance or time I use one of those plastic insulated picnic hamper/coolers. Before adding the fish (in bags) I will acclimatise the inside of the hamper/cooler to a temperature a degree or so above that which the fish are used to for an hour or so using mixed water. The fish are then bagged and added to the hamper/cooler. and they are padded out with additional empty bags of water at their normal temp, and a thermometer is added. The extra bagged water acts to stabilise the temperature (the more water at the desired temperature, the less it will fluctuate). Every few hours I would check the temp (yes I am paranoid), and if it is fluctuating outside of a couple of degrees, the empty water bags can be refilled with compensated temperature water. If I was moving the fish for more than six hours I would change the air in the fish bags, Or get them oxygen filled at the start. I would expect the same philosophy could be applied to styro boxes. ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!