Just general bad luck or the lack of ability to grow it.
The first tissue culture cup from dennerle arrived in not the best of conditions. and promptly melted away to nothingness over time. Come to think of it, my current cup of pogostemon helferi from dennerle is melting away too. I wonder if plants grown in that gel cocktail of dennerle are just not liking my tank!
My second attempt was a juvenile plant bought off of fleabay. This guy survived, but is .. in probably survival mode. It puts up leaves as fast as it loses them.. or shall I say, it loses leaves as fast as it puts em up. So, no net gain. plant purgatory is the phrase I used for someone else the other day
My third attempt to follow rumors of finding the tissue cultures available at petco from "Complete Aquatic Systems" yielded in one super badly melted bag and months of wild goose chasing with associates who simply had no idea when they would get a shipping or even if they sold it at all despite me being able to give them the sku.
There's also various threads of inconsistencies with this plant on here
just search crypt flamingo and follow through all those threads if you want more
I've seen a couple people on the facebook pages grow it decently, but on here, I've only known @Xiaozhuang
(maybe finally), and @kaldurak
to grow it awesomely. Even kaldurak uses the flamingo and pink panther names interchangeably in his progression soooo, take it with a grain of salt
has an awesome page dedicated to it: https://www.advancedplantedtank.com/..._flamingo.html
At this point, it's a crapshoot, so I wish you the best of luck and hope you a) find good starting stock and b) have great success and post about it so that I can add you to my mental shortlist of successful pink crypt keepers!