Do You Turn Wavemaker off at Night?

In the wild rivers don't stop flowing at night, so leaving it on at night shouldn't cause an issue, but if you want to be safe you can just turn night mode on, it lowers the power when lights in the room are turned off.

Do you leave powerheads on all the time?

Leave the powerhead running 24/7. You should leave it on all the time because it helps with oxygen levels in the tank. "If sometimes you feel little, useless, offended or depressed or get that loser feeling, always remember that you were once the fastest and most victorious sperm out of hundreds of millions..."

Do you turn marine tank lights off at night?

You can shut off your aquarium's lights anytime you want, so long as they're consistently on for about 12 hours and off for the same length of time. Most aquarists prefer shutting them off at night because they would rather see the tank lit up during the day.