1 - how long do they last? Not long once your axies realise they taste nice
I've put in 6-12 at a time and usually most of them are gone within a few days to a week. You'll get the odd rambo shrimp who seems to be able to survive for long periods on his own, but eventually the axies get 'em all. My theory is that if i get enough shrimp in there they will breed and be self sustaining. Hasnt happened yet, i either havent put enough in at first, or the temp is too low for them to actually breed. They survive in the cold axie tank, but im yet to see if they will breed
2 - what do they eat? Scraps, algae, fish flakes if need be - they are good tank cleaners. I dont actually feed my shrimp anything specifically, they just survivie on cleaning up the tank and left over fish flakes
3 - What do they need? ??? You mean tank set up? google it, plenty of fact sheets out there - but suffice to say my red cherries survive fine in my axie tank. The only thing i dont know is if they will breed in the cold water - they prefer 25 celc or so, but survive much lower
4 - What type do I get if I expect my wild type to eat them? LOL - Cheap ones. If you grow live plants you can go to aquarium plant or shrimp forums (google is your friend) and swap, sell or buy. Thats probably the cheapest way, but you can get them at your LFS for $3 in AU. People who breed shrimp will gladly swap with you to freshen the blood lines, they breed so fast that inbreeding is inevitable and new blood every 3-4 months is a good idea.
Bren