I use an Aqualight Digital Power Center by Coralife. It's a power bar with 8 outlets rated for 1875 watts. One bank of 4 outlets is always on and the second bank is on an 'alternate' on/off cycle. These are color coded yellow (daytime) - blue (nighttime) and whenever one set is ON the other set is OFF as determined by your settings of the digital timer. The power bar can be used either as a wavemaker or lighting timer. In your case, you'd want to control the Tunzes with it meaning you would need a separate timer for your lights. You'd also need to stretch the timing longer than 2 hours since the timer has a maximum of 7 cycles you can set. These cost anywhere from 30 to 60 dollars depending on where you get them.
Can Tire or most home improvement stores should have Noma digital timers for around $10 (model RCT100). These have 20 programmable cycles but only one outlet. You'd need one of these for each Tunze and set each one up independently to get the 2 hour cycle you're looking for... and a third/fourth to run the lights/Mag 3.
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