Interesting comment. I'd like to know more. Is everyone in agreement with the Algagen pods?
I've heard good things about Algagen and I've never heard anything bad about Tisbe sp. copepods.
Truthfully, this is the first I've heard anything bad said about T. californicus. T. californicus is adapted to eat detritus on the bottom, so it sounds likely that it's an omnivore. In fact, I feed them crushed fish food, so they certainly eat dead meat products. They also eat phytoplankton and I've maintained them exclusively on phyto for months at a time, so it's just false that they are carnivores, at least obligate carnivores.
They are routinely used as an offering to larval fish by professionals in aquaculture, so I doubt fish larvae have anything to fear from them. In fact, if they're found eating fish larvae, the larvae was likely dead and floated to the bottom before the copepods started snacking.
I haven't noticed T. californicus out-competing any of the other copepods in my systems, nor amphipods (which, granted, are brooders and shouldn't have anything to fear from egg eaters), nor cerith snails that do reproduce from eggs left on the tank glass. The other small inverts also seem to do fine. In fact, the amphipods are the ones I see eating snail eggs. (Grr, evil amphipods....

)
I've had them in continuous culture for over a year, so being in a fairly tropical environment hasn't seemed to harm them much in my cultures. But, given that I'm just using them for food, I don't know what them being from a temperate climate really has to do with anything. In fact, being from a temperate climate would make them less likely to displace tropical copepods in a tropical system, right?
Then again, I'm not a copepod expert so all might be true. If you really want to know, I'd advise asking Adelaide at
http://www.essentiallivefeeds.com/. She _is_ a copepod expert and very nice, too.
Good luck!