I'll throw in a little story of my recent (meaning last night) experience with the Blue Spot Toby Puffer...
I have a BUNCH of fish in the DT including a fat, healthy Cleaner Wrasse who is always busy cleaning the tankmates.
We added the puffer (maybe, 3.5" in overall length) to the DT last night.
He was immediately super chill and not hiding... PERFECT!
Wife and I had just sat down to enjoy watching it when the Cleaner Wrasse (which we really like as it has a pretty personable attitude) spotted the puffer, darting over to "clean" it... and then all hell broke loose.
The Cleaner Wrasse chased the puffer lightning-fast from one end of the tank to the other and all around the rockwork.
It was absolutely merciless and non-stop.
It was bad and getting worse by the second.
My wife and I jumped up and grabbed nets to try and catch the wrasse.
We stood (on stools) on either side of the glass and flailed the nets all around the tank to catch it... all the while, it didn't stop chasing the puffer.
FINALLY, after basically destroying the stacked rockwork and leaving the water in an absolute clouded mess, it was caught and promptly dropped into the overflow.
Although this very well could be an isolated experience, I would most definitely not recommend housing a Toby Puffer with a Cleaner Wrasse.
Hey, Cleaner Wrasse... remember the LFS?
UPDATE:
The Cleaner Wrasse jumped over the weir and back into the DT while I happened to be watching the tank (fine, I’m always watching! Ha) and the mayhem began once again.
This time I let the situation be, and, after an hour or so, the Cleaner Wrasse lost interest in chasing the puffer.
They’ve been in complete harmony since...