My caribe did that when they were small untill they got larger. I just added some aquarium salt yesterday for my water change and they are all over the tank today for the first time. Its kinda weird. I've had these p's for 2 weeks and maybe they are finally settling in.
How long have you had your p's? How big is the tank.
it still new to them .give them a week or so..mine did the same thing when i moved them into the 100g.. they only stay on the right of the tank..now they have been in for awhile and they are all over the place
Mine swim alot but still huddles in the middle when I get close to the tank to watch them.. and its been a month since I first got them. Ive raised temp, and even tried to scare them in another part of the tank, but still they huddle from time to time.