Tigger pods are hard to keep in a fuge. My guess is that they are tide pool copepods, and so have a hard time dealing with anything but periodic waves. Constant flow, unless it is really low, would make it hard for them to keep populations up. Feeding is important too. I don’t think that they NEED phytofeast, but it definitely is optimal nutrition for them. So if you’re not feeding your fuge, they may have an even harder time surviving.I have a pretty good fuge but have noticed my pod population (Tigers) is way down/on the way out. Silly pajama cardinals are hunting them like they're wrasses! Also, I stopped dosing phyto. If you're guessing, is that the problem? No phyto to tide them over through that stage of development? I'm really not interested in culturing them if I can keep a sustainable population in my fuge. I don't have a mandarin or anything. I just like the bio-diversity.
If you want copepods in your fuge, go for apocyclops (Apex-pods from Reed) or Tisbe Pods. Either will colonize a fuge and the rest of your tank in about a month.