Is this your permanent pond, or is this just your winter pond? If it's just your winter pond I wouldn't go to crazy.
Just an idea to hide some of the liner that hangs out of the pond, you could maybe use some better wood. Cedar would look nice. You could cover the outside and cap the top. Just don't use nails that are too long that would puncture the liner on the inside of the pond. Maybe even some type of fake stone or tile you could glue onto your exixting wood.
You can use black pipe, it doesn't stick out as much as the white. Maybe reroute your thinner pipe closer to the edges to hide it better.
Plants are nice to hide stuff, but since you indoors that's really not an option.
I see all of these posts about indoor ponds. It's making me want one. My wife would KILL me.
Just some ideas. I hope this helps.
Mike