I have an L600 and L375 Both pseudacanthicus. And It's great idea to have ahiding places for them. they love to hide. But you can allways use PVC tubes and cut a small portion of the bottom off so they sit on the bottom and won't roll around. I feed some vegitation when I got the L375 but that's what they feed him at the LFS. Now if I put any veg in the tank he won't touch it. He really preferes protein based foods. And My L600 LOVES hikari sinking pellets. They have never yet showed aggression towards each other. and they are both over 9". I want to get at least one more but it's hard to find these guys at a large size for a good price.
Hope that helps.
Hope that helps.