One of my sugar glider constantly has his tail up, like the way a cat does. The other never holds his tail up like this.

So sorry for the delay in getting a response to you. How's your glider been doing lately? I really don't know the answer to your tail question so hopefully someone else will respond. The only time my glider holds her tail up is when she's pooping or peeing. Is your glider otherwise acting normally? Is he eating and drinking well, and also pooping and peeing consistently?

we have one glider that loves to run around with her tail up, she's been doing it since we got her about 3 years ago. I don't know why she does it