warm bottle planktons are little more than pollution in a bottle IMO, lots of people use them but your paying for a lot of DEAD plankton who's nutrients are leaching into the water in the bottle, making them uncomsumable to little other than algae. really the best way to go is live planktons (I understand how hard they are to get ahold of for a lot of people) second best for zoo plankton would be frozen, second best for phtyo would be refrigerated, zooplankton in a bottle is just a total waste of money, its water with VERY little zoo.
here is an Idea for bottled zooplankton enthusiasts, buy a bottle pour the whole thing through a brine net (or coffe filter) and see how much actual zoo you get. your going to be very dissapointed.