Tigger-Pods are definately NOT a cold water species. We have 30 high yielding tanks full of them that grow between 70-85 F. Here is a link that will provide more information about them: https://reefnutritionfaq.pbworks.com/Tigger-Pods FAQ When copepods disappear out of a system its usually for one of two reasons: 1) a predator consumes them faster than they can reproduce, or 2) they starve. The limiting factor on copepod biomass is usually the amount of available food. Reef systems naturally produce a small amount of microalgae and the copepods feed on that. If you add a higher bio-load (a bottle of copepods, especially large copepods like Tiggers) but don't supplement daily with microalgae, they can quickly starve. If there are no predators (refugiums and sumps are are great place) and the copepods are fed daily with microalgae, your system should be able to produce a ton of them.