help!

Hello TCMAS! I need to setup a pre-owned saltwater tank by tomorrow evening because a large column of live rock will be delivered. I have a freshwater setup. I know ABSOLUTELY NOTHING about saltwater science and operation. I am asking for help bringing the tank and equipment in from my...

Firstly - lets start with - I know nothing about circuitry outside of how to solder stuff together. Over the last month - I've been trying to make a circuit which I can connect a float switch, toggle switch, 9v battery, and buzzer. When the float switch turns on, the buzzer beeps every 5...