I think there are tiny heaters you can get- ask the betta people. Also not sure what the temperature params for different shrimps are- buy you can look that up.
/www.fishforums.net/index.php?showtopic=18252What can you put in a 2 gal tank, undergravel filter no heater. Something other than bettas?
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. You could put a couple of cherry shrimp in there too, or an adf once the triops get bigger. But remember if you want more triops late ron you will have to dry out the gravel so the shrimp and adf would have to have a place to go in the meantime.