I have wired a complete fishhouse for quarantine with a light over each of 40 tanks and a 12 volt pilot light system, plugs for filters, hot water system and all. I got a sparky in and said what I intended and he left all the correct wiring them came back and connected it up. The inspecter new it had not been done by a sparky because I used more clips and left more wire at the board than a sparky would. The combination of electricity,metal stands, water and the fact that you can't earth an aquarium is not a good one. I would say: Do what you can but get it checked by an expert. Good luck