I've got 3, actually did get em from WalMart as a rescue attempt.
So far so good!
Been a couple months now, got em half way to marine, they seem to enjoy it. Don't do more than the .02 per week.
Otherwise ya, the one in that vid is stressed. The black on the lower portion of them is their "stress meter". The more covered/black it is, the more stressed they are.
Got em with a dragon/violet goby, it's hillarious.
At first when I put it in the tank with the gsp's, one saw the tail and thought it was food being dumped in, started to go after it, but realized it was another creature.
All 3 stared it down while it was motionless in the corner once, thinking maybe they COULD eat it.
Nope. They got close enough that it started to move just a little, and all 3 gsp's darted off like a bat outta ****.
All the time now they sure get the $%&^ out of the way if the goby is every going anywhere.
They have gotten more used to him, but otherwise ya, they're scared of him... It was their tank too for a good month or so, so evidently if you have a big scary looking fish, they might not go for them...
Perfrect combo though cause I needed a janitor/sand sifter.