How 'bout a remote control/auto mini submarine? That would solve a few issues already listed here. A lttle like a roomba, goes around harvesting unwanted algae & stuff, then parks itself when done. Option for remote control so you can drive it around to do other stuff. Maybe it could even have probes on it too, with a wireless xmitter to send paramaters to your notebook or smart phone.
As far as skillsets, I have an electrical/electronics background and am fairly handy with some other stuff too.
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