Just changed the water in my tank this morning, added the de-chlorinating agent etc. Transferred my other fish first, they were ok after twenty minutes of monitoring, so then i added the ray. He just went to the bottom and stay there raised up on the edges of his disk, is that normal behavior after a water change? The water temp of the tank was just one degree lower than the water where i kept him while doing the change. Also i noticed these two spots to the front of his disk, where there are these tiny bumps in patches, is that something i should be concerned about?
It's my first ray and i know i probably sound like a true novice (which i probably am), but i just want to be sure that everything is ok with him.

It's my first ray and i know i probably sound like a true novice (which i probably am), but i just want to be sure that everything is ok with him.
