The wavemaker for the maxijets is definitely worth it IMO. And MJ1200 put out a lot for a little inexpensive powerhead. And you can not beat the deal at AW for them either (6 for $95). That price is right!!! The MJ only pulls 20 amps, so you can gang 3 up on a digital timer and turn them on and off several times each day. 2 timers, opposite times.

Taking the SQWD off the Mag18 will help you a lot. Then you can put the Mag18 on a timer. Run it 4 hours, then 2 off if you want to closely simulate the oceans rotary currents. Well, as close as you can with one pump anyway. A Mag18 with a Y split, two lines coming back in will help your flow situation immensely. These SQWDs are better in smaller tanks or with several SQWDs if you have a large tank like a 175 bow with lots of rock. They don't stay on long enough per side to do anything much if there is just one in a 175. Maybe get a little local area turbulence but thats about it.