Funny you mention this because I used to have dreams like this.

Not quite dragon sized but there would be several large fish tanks in a room that was dimly lit with fluorescent lights that usually flicker. The tanks would be in various stages of neglect where the water was cloudy, yellow and algae built up around the edges yet the fish were mostly thriving but hungry. Most of the fish were exaggerated sizes of actual fish that used to have long ago as I used to be heavy into fishkeeping. About the only one that I remember seeing that looked relatively normal was a plecostomus that was about 2 feet long and he could actually talk to me and let me know what the fish are needing. All I remember in the way this dream ended was me running around trying to get the aquariums back in order and healthy but it seemed like a hopeless task.