Unfortunately yes.. but two crows did a good job explaining it as well as the previous poster.. GOOD job, following the sage advice.. 3 is a GOOD number for small chick groups.. and one is definitely not a happy creature with none of it's own kind to communicate with.. they will be much more well rounded and functional now!
As suggested add in some enrichment.. colorful polka dots on the walls, shiny marbles, anything interesting to explore the world around them and help their brains develop cognition... Just like human babies, dog babies, and many other animal babies.. they do this by putting everything in their mouth.. one of the ways they sense the world around them.
Crickets.. can be an all out BLAST!
Red lamp allows for more natural sleep pattern than white.. but infrared or
heat plate are far superior to BOTH and allow for a full natural night time cycle.. rested chicks are happy chicks. The red lamp also helps hide any accidental blood spots.. fades them out.. because chicks peck at things that look different or out of place.. it might be a bug.. if they taste that rich blood then they may not stop.. So it helps prevent SOME pecking.. in both these ways.
No chick or chicken is TRULY fine being alone long term.. they aren't lone creatures.. they're flock creatures.
Short term.. all will deal.. and look to connect with something else..
Long term.. that's cruelty to animals... and spoken by someone who can't sense what the chicken.. is missing, feeling, etc.. I've SEEN them show compassion and empathy to each other.. Humans rely too much on what is said.. instead of seeing that so much MORE in communicated far beyond vocalizations with familiar sounds and associations..
I realize it's not always a choice to get another chick and things happen beyond our control at times.. But if it's an option.. don't make an animal adjust to known unnatural conditions.. that's surviving.. which is much MUCH different than thriving.. Most of us were created resilient and can choose to thrive despite being placed in undesirable circumstances..
Saying I value the encouragement that it can be done if needed.. but denounce ANY insinuation that it's an okay choice.