Hmmm....With the first one, could you perhaps flip the rock so as then the bottom of the hide is touching the substrate? This is just my opinion, but I always feel that they are much more secure if they have something to fully bunker into, like submerging themselves in the substrate in a hide rather then laying flat on top of a rock. And maybe a hide on the cold ends for both, perhaps? But otherwise looks all good to me~!
For the stone, Ive mentioned this a few times to different people - Can you cut yourself on it? If no, then I wouldnt worry about it, as it definitely wont hurt a bluey. If yes or possibly if you held it for a while or something, then I would grind it down, but for your sake more so then the blueys - You dont want to cut yourself and then run the risk of dropping it onto your bluey or breaking something else in the tank/ your foot.
