There's been a few raspberry pi based projects that have taken this on. Automated dosers, automated timers are really easy, I would love to see one with a heater controller built in. Remote access can be done via an app, but its super glitchy. I tried this with my carputer as a remote and got about the same results. Side note the windows carputer is getting swapped for an android or raspberry pi mini pc soon in that car running android in one of my other cars and its easier to interface with on a small screen.
An underwater camera would be a cool gimmick.