Very long story short, I have a fish whose entire caudal end is non-functional. Basically, her entire back end seems to be paralyzed. She is able to swim a little (forward only) using her pectorals and getting a little wiggle going through her body from the front. She is very active and eats well, and otherwise seems to be in pretty good shape. She can, however, only live in an inch of water in order to breathe.
SO. I have a new little set-up for her (which is obviously not acceptable for your average fish, but is working really well for her). She has a half-gallon container that is about 3 inches wide and 10 inches long which is perfect for her as she can have walls fairly close on either side incase she needs to prop herself up, but a nice distance to get some exercise (I'll post a pic when I get home tonight).
Here's my issue: Because the water can only ever be an inch deep, I have NO IDEA how to heat this thing. There is not enough water in it for a submersible heater. I don't think using a lamp is optimal because there will be quite a bit of fluctuation when it gets turned off at night. It has been at room temp (~68-70 degrees) so far.
Any suggestions? I want to do right by my old lady fish :)